Introduction

Antonovsky (1987) developed a questionnaire to measure the sense of coherence. The original form, the Orientation to Life Questionnaire, consists of 29 items, 11 items measuring comprehensibility, 10 items measuring manageability, and 8 items measuring meaningfulness. The response alternatives are a semantic scale of 1 point to 7 points, where 1 and 7 indicate extreme feelings about questions (and statements) about how one’s life is experienced (e.g., the question “when you talk to people, do you have the feeling that they do not understand you?” is scored from 1 = never have this feeling to 7 = always have this feeling). The questionnaire is a summed index with a total score ranging from 29 to 203 points for the original scale of 29 questions (SOC-29). A shorter version of 13 questions (SOC-13) of the original form was developed by Antonovsky (1987), where the score ranges between 13 and 91 points. Antonovsky intended that the sense of coherence scales be scored with a single total score and not component scores (Fig. 11.1) since he theorized that it was the sense of coherence in its totality that influenced movement along the ease/dis-ease continuum . This issue is taken up again later in this chapter.

Fig. 11.1
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The original view of the sense of coherence and its three dimensions

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Examples of items measuring the comprehensibility dimension are as follows (Antonovsky, 1987, p. 190ff.):

  • When you talk to people, do you have a feeling that they don’t understand you? (from ‘never have this feeling’ to ‘always have this feeling’)

  • Do you have a feeling that you are in an unfamiliar situation and don’t know what to do? (from ‘very often’ to ‘very seldom or never’)

The following items are examples that measure manageability:

  • When something unpleasant happened in the past your tendency was: (from ‘to eat yourself up about it’ to ‘to say “ok that’s that, I have to live with it” and go on’)

  • When you do something that gives you a good feeling: (from ‘it’s certain that you’ll go on feeling good’ to ‘it’s certain that something will happen to spoil the feeling’)

Meaningfulness is measured with items like these:

  • Doing the things you do every day is: (from ‘a source of deep pleasure and satisfaction’ to ‘a source of pain and boredom’)

  • When you think about your life, you very often: (from ‘feel how good it is to be alive’ to ‘ask yourself why you exist at all’)

Comprehensibility, the cognitive dimension, refers to the extent to which one perceives internal and external stimuli as rationally understandable, and as information that is orderly, coherent, clear, structured rather than noise—that is, chaotic, disordered, random, unexpected, and unexplained (Antonovsky, 1987, p. 17). The ability to create structure out of chaos makes it easier for us to understand one’s context and one’s part in it, for example, one’s role in the family or the workplace. A prerequisite to being able to cope with a stressful situation is that one can, to some extent, understand it. What one comprehends is easier to manage.

Manageability, the instrumental or behavioral dimension, defined as the degree to which one feels that there are resources at one’s disposal that can be used to meet the requirements of the stimuli one is bombarded by Antonovsky (1987, p. 17). Formal resources include, for example, social services and care staff in public and private organizations. Informal resources include, for example, family , a circle of friends, colleagues, and significant others, in other words, people who are trusted and who can be relied on difficult situations. Coping also requires that one is motivated to solve the problems that cause stress, is willing to invest energy to solve the problem, and finds meaning in being able to manage the situation. This leads to the third dimension of the sense of coherence , meaningfulness.

Meaningfulness, the motivational dimension, refers to the extent to which one feels that life has emotional meaning, that at least some of the problems faced in life a face are worth commitment and dedication, and are seen as challenges rather than only as burdens (Antonovsky, 1987, p. 18). One needs to have a clear desire to resolve difficulties and willingness to invest energy to get through experiences of stress that have the potential to cause distress.

The Validity and Reliability of the Sense of Coherence

Face validity:

The sense of coherence scales has been empirically tested in different cultures, both Western and cultures in Africa and Asia. Studies have been conducted on different samples: general populations, different professions, in persons with disabilities, different patient groups as well as in children, adolescents, adults, and elderly, in families, in organizations, and also on a societal level. A systematic research review shows that as of 2003, the SOC-29 and SOC-13 had been used in at least 33 different languages in 32 different countries (Eriksson & Lindström, 2005). An update shows that another 16 languages can be added: Albanian (Roth & Ekblad, 2006), Croatian (Singer & Brähler, 2007), Brazilian (Bonanato et al., 2009), Hungarian (Biro et al., 2010), Korean (Han et al., 2007), Lingala (Bantu language spoken in parts of Africa) (Pham et al., 2010), Persian, Swahili (Rohani et al., 2010) as well as local languages in Africa Afar, Bilein, Hidareb, Kunama people, Nara, Saho, Tigre, and Tigrinya (Almedom et al., 2007; Getnet & Alem, 2019). An update per 2019 at least additional languages can be found: Portuguese (Encarnação et al., 2018) and Slovenia (Stern et al., 2019).

Since 2003, the SOC-29 and the SOC-13 have been used in further 13 countries (Eriksson, 2014): Eritrea (Almedom et al., 2007), Croatia (Pavicic Bosnjak et al., 2012), Hungary (Biro et al., 2010), India (Suraj & Singh, 2011), Iran (Rohani et al., 2010), Italy (Sardu et al., 2012; Ciairano et al., 2010), Korea (Han et al., 2007), Kosovo, the Democratic Republic of Congo (Pham et al., 2010), Spain (Virues-Ortéga et al., 2007), Sudan (Abdelgadir et al., 2009), Taiwan (Tang & Li, 2008), and Turkey (Öztekin & Tezer, 2009). More recent research shows three additional countries: Austria (Mautner et al., 2014), Estonia (Höjdahl et al., 2015), and Malaysia (Rostami et al., 2014). An update per 2019 shows further expansion: Ethiopia (Getnet & Alem, 2019), Ireland (Groarke et al., 2018), Portugal (Encarnação et al., 2018), and Slovenia (Stern et al., 2019).

In sum, the SOC questionnaires have been used in at least 51 different languages in at least 51 different countries around the world (Fig. 11.2).

Fig. 11.2
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The distribution of studies using the sense of coherence scale 1992–2019 in a global context © Monica Eriksson 2017. (All Rights Reserved)

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The translation process: As shown above, SOC-13 has been translated and used in many countries and different populations. Translation of scales and questionnaires requires explicit attention since translation may influence validity (Naaldenberg et al., 2011). According to Fawcett (1997) and the Curitiba Statement on Health Promotion (Sotgiu et al., 2018), several translation techniques have to be used: calque, literal translation, transposition, modulation, reformulation, and adaptation. Transposition means rearranging a sentence’s word sequence in order to satisfy grammatical rules; modulation is replacing original phrases with a set phrase, which has the same significance; reformulation is to express the same concept in a completely different manner; and, finally, adaption explains a concept in the source and target languages in a completely unique way, so it is appropriate to the culture of the recipients.

A critical term is the word “feelings.” In English, the word “feeling” means both “something that you feel through the mind or the senses like hunger, sadness” and “the emotions of a person.” A problem arose in the process of translation of SOC-13 from English to Italian. In Italian, two concepts are expressed, respectively, with the words “sensazione” and “emozione.”

The translation of the question, “Many people – those with even a strong character – sometimes feel like sad sacks (losers) in certain situations. How often have you felt this way in the past?,” revealed a minor difficulty of idiomatic equivalence. In the Italian version, it was necessary to eliminate the idiom “sad sacks” for which there is no corresponding expression. The significance of the question is still guaranteed by the translation of the word “losers.”

Construct validity:

The structure of the sense of coherence is complex. Recent research shows that the sense of coherence seems to be a multidimensional construct rather than a unidimensional as proposed by Antonovsky (1987), with all three dimensions continually interacting with each other and together to form a collective, overarching factor, sense of coherence. Following that, Antonovsky maintained that on theoretical grounds, one should avoid lifting out individual dimensions in order to examine them separately.

Nevertheless, recent research has focused on the study of the structure and content of the sense of coherence. There are studies that support Antonovsky’s idea of the sense of coherence as a general factor with three dimensions (Antonovsky, 1993; Drageset & Haugan, 2015; Klepp et al., 2007; Rajesh et al., 2015; Söderhamn & Holmgren, 2004; Söderhamn et al., 2015; Spadoti Dantas et al., 2014), but these dimensions do not fully fit with comprehensibility, manageability, and meaningfulness. Söderhamn et al. (2015) found evidence in a confirmatory factor analysis that confirmed the SOC-29 as one theoretical construct with three dimensions , comprehensibility, manageability, and meaningfulness. In a cross-sectional survey among Norwegian cognitively intact nursing home residents, Drageset and Haugan (2015) found that the three-factor model fit their data. Lajunen (2019) examined the psychometric properties and the cross-cultural impact of the SOC-13 questionnaire among Australian, Finnish, and Turkish young adults. The findings from all the three countries suggested that the first- and second-order three-factor models fit the data better than the single-factor model. Nor cultural differences in SOC scale scores were found.

Other models obtained with factorial analysis, although three-dimensional and with considerable explained variance, are not related to the traditional dimensions of the SOC. This is in agreement with previous research on SOC factorial dimension that showed different results not fitting with the dimensions of comprehensibility, manageability, and meaningfulness (Togari et al., 2008; Larsson & Kallenberg, 1999).

A high correlation between item “Has it happened in the past that you were surprised by the behavior of people whom you thought you knew well?” and item “Has it happened that people whom you counted on disappointed you?” has been found in several studies (Naaldenberg et al., 2011; Sardu et al., 2012), and was explained by interviewees perceiving these questions as similar. Drageset and Haugan (2015) defined this correlation as “especially troublesome”: the people whom we know well usually also embody the ones we trust or rely on, which is a central focus in OLQ3; you are not supposed to be disappointed by people you trust. Therefore, it seems theoretically reasonable that OLQ2 and OLQ3 share error variance. Nevertheless, including correlated error terms for this pair of items did not yield a good fit with the present data. Lerdal et al. (2017) found psychometric limitations of the 13-item SOC scale using Rasch analysis. Two items demonstrated poor fit, and once they were deleted from the scale, the remaining 11-item scale (SOC-11) demonstrated acceptable item fit. However, neither the SOC-13 nor the SOC-11 met the criteria for unidimensionality or person-response validity. While both the SOC-13 and SOC-11 were able to distinguish three groups of SOC, none of the subscales could distinguish any such groups. Recent research suggests that the sense of coherence seems to be a multidimensional concept consisting of many different dimensions rather than a single factor (Eriksson & Lindström, 2005; Feldt, 2007; Naaldenberg et al., 2011). Figure 11.3 shows the sense of coherence as a multidimensional construct.

Fig. 11.3
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The sense of coherence as a multidimensional construct. (1) Antonovsky, 1987, (2) Sandell et al., 1998, (3) Sakano & Yajima, 2005

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Sandell et al. (1998) examined the sense of coherence instrument among a sample of Swedes and could not find support for a common factor, nor the three dimensions of comprehensibility, manageability , and meaningfulness. Three more or less stable dimensions emerged, where lust and depression were two extremes which could best be referred to the dimension of meaningfulness. Antonovsky’s concept comprehensibility could in this study be seen in the form of tolerance versus intolerance. The third factor, manageability, was reflected by trust and distrust (Sandell et al., 1998, p. 701).

In the model reported by Larsson and Kallenberg (1999) in Sweden, the first factor appears to measure mainly anxiety and inner tension, although they partly also reflect one’s ability to manage these emotions, the second factor covers comprehension regarding social perception, and the third factor appears to measure sense of personal meaningfulness and satisfaction. Also in the Sardinian general population, the model obtained with factorial analysis, although three-dimensional and with considerable explained variance, is not related to the traditional dimensions of SOC represented in more than one factor (Sardu et al., 2012. The same model was substantially confirmed in samples of students and persons affected by chronic diseases.

Although a clear structure based on the three components was never obtained, three more or less stable dimensions emerged in most of the studies that have explored SOC-13 dimensions. The main factor normally involves most of the questions related to Antonovsky’s comprehensibility component (items 6, 8, 9,11) but also items related to manageability (13 and sometimes 5). The Antonovsky’s meaningfulness component (items 12, 1, 4, 7) is mainly represented in the second factor but also shows relevant correlations with the first one (in Sardinia all these items are combined with comprehensibility in the first factor). In the Sardinian study, question 10 (manageability dimension) does not show a stable pattern (Sardu et al., 2012). So one factor identified the comprehensibility component, and a second factor correlated very strongly with meaningfulness. The third factor was related to questions B and C that, as previously discussed, are part of different dimensions, yet are strongly correlated.

On the basis of the present findings, one may conclude that the factorial structure of the SOCS is sufficiently stable across different samples, although the emerging factors are not related to the traditional Antonovsky’s dimensions of SOC. Sandell et al. (1998) conclude that these patterns are clouded by the fact that the items are indeed not “cleanly” referring to one or the other component, as Antonovsky endeavored (Table 11.1).

Table 11.1 Factorial structure (factor loadings) in a number of European populations
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Consensual validity is a term that indicates the extent to which various scientists agree on the properties of an instrument (Cooper, 1998). The consensual validity is somewhat weak. While many researchers use either the SOC-29 or the SOC-13, there are also many different modified versions in use, with different numbers of questions and different possibilities of response options. Most of the modified versions have partially abandoned the original scale of 1–7 points (but the wording of the questions is usually the same as in the SOC-29 and SOC-13). Results from a research review 1992–2003 showed that there were at least 15 different modified forms consisting of only 3 questions to 28 questions (Eriksson & Lindström, 2005). This includes the particular version adapted for families (FSOC) (Antonovsky & Sourani, 1988; Sagy & Antonovsky, 1992), for children (Margalit & Efrati, 1996), and a version for a school context (Nash, 2002). The Children’s Orientation to Life Scale consists of 16 questions plus 3 distracters (Idan & Margalit, 2014; Margalit & Efrati, 1996). The response options follow a scale of 1–4, where 4 indicates the highest degree of sense of coherence. There are also two variants of the FSOC, the original with 26 questions and a shorter version with 12 questions (Antonovsky & Sourani, 1988; Sagy, 2008; Sagy & Antonovsky, 1992). The questions are the same as in the original form but tailored to the child or a family context. Table 11.2 provides a summary of some of the other sense of coherence scales in the literature, demonstrating a range of items from 3 to 16, and intended for use by various sociodemographic groups.

Table 11.2 A selection of different versions of the sense of coherence instrument
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Antonovsky (1979) originally described the sense of coherence as an individual property. He later widened the perspective (Antonovsky, 1987) with sense of coherence also conceived at the family level. Recent research shows that the sense of coherence concept and measurement also can be applied in organizations such as a workplace (Bauer & Jenny, 2012; Bringsén, 2010; Bringsén et al., 2009; Forbech & Hanson, 2013; Graeser, 2011; Mayer & Krause, 2011; Mayer & Boness, 2011; Nilsson et al., 2012; Orvik & Axelsson, 2012; Vogt et al., 2013).

Research that examines and discusses salutogenesis and the sense of coherence at a societal level is sparse. Braun-Lewensohn and Sagy (2011) report findings from studies using an instrument adapted for the societal sense of coherence (Sense of Community Coherence), which contains seven questions describing how the individual experiences the society in terms of comprehensibility, manageability, and meaningfulness. Comprehensibility at the societal level addresses the experience of society as more or less organized in a way that makes life somewhat predictable, that the structure of society can be more or less understood, and that society is perceived as more or less safe and secure. Manageability is a state in which the individual experiences a society with resources that support individuals, for example, in emergencies or critical situations. Societal support includes, for example, programs to support young people’s mental health and initiatives to create conditions so that people from different generations can meet each other. Meaningfulness refers to the experience that society supports people to experience fulfillment, to develop their abilities, and to feel satisfied with life (Braun-Lewensohn & Sagy, 2011, p. 535).

The relevance of salutogenesis and the sense of coherence to the building of healthy public policy has also been a focus of theorizing and research (Eriksson et al., 2007; Lindström & Eriksson, 2009). To develop a social policy based on the salutogenic framework means to identify resources for health and welfare of the society, in the past as well as in the present, including risks of illnesses, and how this knowledge and the most effective measures can be used to resolve the current challenges. The core of such policy is to create coherence and synergies, from individuals to groups and organizations in the local community, and finally to the whole of society (Eriksson & Lindström, 2014; Lindström & Eriksson, 2009).

Criterion validity:

Eriksson and Lindström (2005) present information about the relation between the SOC-29 and other instruments measuring health, perceived self, stressors, quality of life, well-being, attitudes, and behaviors. The correlation with health ranges in general from slight to good, using instruments such as the General Health Questionnaire, the Health Index, the Hopkin’s Symptom Checklist, and the Mental Health Inventory, with such health measures explaining up to 66% of the variance in the SOC-29. There seems to be an overlap between the sense of coherence and the Big Five (Kase et al., 2018). Neuroticism was here negatively correlated, and extraversion was positively correlated with comprehensibility (r −0.47, 0.35), manageability (r −0.44, 0.26), and meaningfulness (r −0.28, 0.30). These correlations were strong, and the overlap between the two scales was about 36 percent. Also, there are a number of studies on the relation between SOC and quality of life and well-being. In general, they show that a high SOC is related to a high quality of life Eriksson and Lindström (2005).

Predictive validity:

The ability of an instrument to predict how, for example, health develops in the future is called predictive validity (Abramson & Abramson, 1999). The predictive validity of the sense of coherence questionnaire seems to be relatively good, based on a review of longitudinal studies (Eriksson & Lindström, 2005). There are studies that support predictive ability (Lundman et al., 2010; Luutonen et al., 2011; Poppius et al., 2006; Surtees et al., 2003), whereas other studies have not done so (Norekvål et al., 2010). It seems that the time for follow-up is an important factor for the predictive ability of the instrument. The results of a study among elderly persons, the Umeå 85+ study, show that the sense of coherence predicted mortality at 1-year follow-up, but not at follow-up after 4 years (Lundman et al., 2010).

Reliability:

SOC-29 test–retest correlations range from 0.69 to 0.78 (1 year), 0.64 (3 years), 0:42 to 00:45 (4 years), 0:59 to 0.67 (5 years), and finally 0:54 after the 10-year follow-up (Eriksson & Lindström, 2005). More recent research provides support for the stability over time, in 1- to 3-year perspective (Lindblad, Sandelin, Petersson et al., 2016). The internal consistency measured by Cronbach’s alpha ranges from 0.70 to 0.95 using SOC-29 (124 studies) and 0.70 to 0.92 (127 studies) using SOC-13 (Eriksson & Lindström, 2005, p. 463). The sense of coherence scale shows high internal consistency overall. However , there are other results reported. Among Swedish nurses working at hospitals, the internal consistency, measured by Cronbach’s alpha , was as low as 0.63 (Eriksson et al., 2019). An inter-item-correlation test indicated that item 5 “Do you have the feeling that you’re being treated unfairly?” and item 6 “Do you have the feeling that you are in an unfamiliar situation and don’t know what to do?” decreased the internal consistency.

Critique of the SOC-29 and SOC-13

One indirect form of criticism has practical roots: as mentioned earlier, various senses of coherence measures have been developed that are shorter than even the SOC-13, as short as just three items. This reflects the reality that in many health survey applications, questionnaires must be very short. More directly, the SOC-29 and SOC-13 have been criticized based on supposed shortcomings in the instruments’ psychometric properties (Korotkov, 1993; Larsson & Kallenberg, 1999; Schnyder et al., 2000). It is also asserted that the sense of coherence concept does not deal adequately with emotional aspects of life experience (Flannery & Flannery, 1990; Flensborg-Madsen et al., 2006c; Korotkov, 1993; Korotkov & Hannah, 1994). Inconsistent evidence about the lability/stability of the sense of coherence over the life course has also been noted by critics (Geyer, 1997). Criticism of salutogenesis generally includes implicit doubt about efforts to measure the sense of coherence via any means (Bengel et al., 1999; Kumlin, 1998). The leveling of such criticism is welcome as part of the healthy evolution of a “living” theory or model, and responses to the critics are published (Eriksson, 2007; Lindström & Eriksson, 2010).

In the limits of this chapter , we focus on just the critical ideas of Flensborg-Madsen et al. (2005a). The critique stems from their conclusion that the SOC-29 and SOC-13 are only moderately to weakly related to various measures of physical health (Flensborg-Madsen et al., 2005a), leading them to construct and test a new measure of the sense of coherence, intended to overcome limitations in the SOC-29 and SOC-13 (Flensborg-Madsen et al., 2006a, 2006b). Their critique can be summarized in this way:

  • Antonovsky presumed that one’s internal and external environment has to be predictable in order for a person to have a high sense of coherence.

  • Predictability should not be included in conceptualizing and measuring the sense of coherence, because lack of predictability is not necessarily unhealthy.

  • Instead, unpredictability is what makes life matter in the first place; it can provide a state of initiative, energy, and positive attitudes.

Since the SOC-29 includes several items that have to do with predictability, Flensborg-Madsen et al. (2005b) regard the instrument as flawed and they developed an alternative 9-item measure that excluded the concept of predictability, but that otherwise was purportedly built, as they write, on the same idea, theory, and conceptualization used by Antonovsky (Flensborg-Madsen et al., 2006a, 2006b).

Their conclusion about a weak association between the SOC-29 and SOC-13 and physical health is based on a review of about 50 studies (2005a). They categorize the health instruments in the reviewed studies as having foci on physical health, biological measures, psychological measures, health measures incorporating psychological aspects, stress, and behavioral aspects. They conclude that the SOC scales are unable to explain health that is measured only in physical terms (Flensborg-Madsen et al., 2005a, p. 665). As a solution, Flensborg-Madsen et al. (2006c) propose the concept of “emotional coherence” in relation to physical health and “mental coherence” in relation to psychological health. This is supported by Endler et al. (2008).

Such fragmentation of the concept of the sense of coherence into physical and mental components breaks significantly from Antonovsky’s fundamental notion of an “orientation to life” (1979, 1987). Such fragmentation also reinforces the physical health/mental health divide in modern health care (and in the public’s imagination), which has been challenged vigorously (WHO, 2001).

We move on to the issue of excluding predictability in the sense of coherence measurement; to do so is to depart emphatically from “the same idea, theory and conceptualization” used by Antonovsky, who wrote:

From the time of birth, or even earlier, we constantly go through situations of challenge and response, stress, tension, and resolution. The more these experiences are characterized by consistency, participation in shaping outcome, and an underload-overload balance of stimuli, the more we begin to see the world as being coherent and predictable. When, however, one’s experiences all tend to be predictable, one is inevitably due for unpleasant surprises that cannot be handled, and one’s sense of coherence is weakened accordingly. Paradoxically, then, a measure of unpredictable experiences-which call forth hitherto unknown resources—is essential for a strong sense of coherence. One then learns to expect some measure of the unexpected. When there is little or no predictability, there is not much one can do except seek to hide until the storm (of life) is over, hoping not to be noticed. Or else one strikes out blindly and at random until exhaustion sets in. No defense mechanisms can be adequate. We must note an implicit assumption here. If a strong sense of coherence is to develop, one’s experiences must be not only by and large predictable but also by and large rewarding, yet with some measure of frustration and punishment. (Antonovsky, 1979, p. 187)

As this extended passage makes clear, reasonable predictability functions inextricably with many other aspects of experience to shape the sense of coherence.

Sense of Coherence Develops Over Time

According to Antonovsky (1987), sense of coherence develops until the age of about 30 years. After that, the sense of coherence was estimated to remain relatively stable until retirement, after which a decrease was expected. This assumption finds no support in subsequent empirical research. The sense of coherence seems to be relatively stable over time, but not as stable as Antonovsky assumed. Research shows that sense of coherence develops over the entire life cycle and increases with age (Feldt, Lintula, et al., 2007; Feldt, Metsäpelto, et al., 2007; Nilsson et al., 2010). Nilsson and co-authors were able to demonstrate on a sample of 43,500 Swedish respondents, aged 18–85 years , that sense of coherence increases with age in both men and women. Support for a corresponding development of the sense of coherence over time could also be seen in a longitudinal study of more than 18,000 Finns, in the Health and Social Support Study, where the sense of coherence continuously increased with age. A strong sense of coherence initially appears to determine its development over time (Feldt et al., 2011). There is a lack of longitudinal studies with long-term follow-up. The most extended follow-up is that of 13 years (Hakanen et al., 2007). Table 11.3 shows findings from longitudinal studies with different follow-up periods.

Table 11.3 The development of the sense of coherence over time, based on a sample of longitudinal studies
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Salutogenesis Is More than the Measurement of the Sense of Coherence

Salutogenesis, focusing on health and people’s resources, is something more than the measurement of the sense of coherence. Today, we can talk about salutogenesis as an umbrella concept with many different theories and concepts with salutogenic elements and dimensions (Lindström & Eriksson, 2010). There is extensive research that focuses on the resources of individuals, groups, and communities. All this and more can be accommodated under the common umbrella. Figure 11.4 shows some related concepts to the sense of coherence collected under an umbrella.

Fig. 11.4
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The salutogenic umbrella , salutogenesis as an umbrella concept © Monica Eriksson 2017. (All rights reserved)

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