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Journal of Child and Family Studies

, Volume 27, Issue 7, pp 2354–2364 | Cite as

Positive Parenting Moderates the Association between Temperament and Self-Regulation in Low-Income Toddlers

  • Ju-Hyun Song
  • Alison L. Miller
  • Christy Y. Y. Leung
  • Julie C. Lumeng
  • Katherine L. Rosenblum
Original Paper
  • 479 Downloads

Abstract

Self-regulation develops rapidly during the toddler years and underlies many important developmental outcomes, including social-emotional competence and academic achievement. It is important to understand factors that contribute to early self-regulation skills among children at risk for adjustment difficulties in these domains, such as children growing up in poverty. The current study examined mother-reported child temperament (negative affect, effortful control) and observed maternal parenting (during a mother–child free play) as contributing factors to toddlers’ observed self-regulation during delay of gratification tasks at 27 months (snack delay) and 33 months (gift delay). Participants were 198 toddlers (Mage = 27 months; 53% boys; 48% non-Hispanic white) and their mothers from low-income families. Mothers’ negative parenting characterized by negative affect, hostility, and negative control was associated with poorer self-regulation contemporaneously. Toddlers’ lower negative affect and higher effortful control predicted better self-regulation at 33 months, but positive parenting characterized by positive affect and sensitivity moderated these associations at both time points. Specifically, we found a buffering effect of high positive parenting among toddlers with a temperamental risk and a deleterious effect of low positive parenting despite toddlers’ temperamental strength. Results highlight the importance of positive parenting for fostering the development of self-regulation among toddlers growing up with poverty-related and child-level risks.

Keywords

Temperament Parenting Self-regulation Low-income Toddlerhood Observational method 

Notes

Acknowledgements

This study was funded by the National Institutes of Health (1R01HD069179).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Ethical Approval

All study procedures were in accordance with the ethical standards of the institutional research committee, and were approved by the Institutional Review Board at the University of Michigan (HUM00045015).

Informed Consent

Informed consent was obtained from all individual participants included in the study.

References

  1. Adler, N. E., Boyce, T., Chesney, M. A., Folkman, S., & Syme, L. (1993). Socioeconomic inequalities in health: No easy solution. Journal of the American Medical Association, 269, 3140–3145.  https://doi.org/10.1001/jama.1993.03500240084031.CrossRefPubMedGoogle Scholar
  2. Aiken, L. S., & West, S. G. (1991). Multiple regression: Testing and interpreting interactions. Thousand Oaks, CA: Sage Publications, Inc.Google Scholar
  3. Arbuckle, J. L. (2013). Amos (Version 22.0)[Computer Program]. Chicago: IBM SPSS.Google Scholar
  4. Belsky, J., Hsieh, K., & Crnic, K. (1998). Mothering, fathering, and infant negativity as antecedents of boys’ externalizing problems and inhibition at age 3 years: Differential susceptibility to rearing experience? Development and Psychopathology, 10, 301–319.  https://doi.org/10.1017/S095457949800162X.CrossRefPubMedGoogle Scholar
  5. Black, M. M., Dubowitz, H., & Starr, Jr., R. H. (1999). African American fathers in low income, urban families: development, behavior, and home environment of their three-year-old children. Child Development, 70, 967–978.  https://doi.org/10.1111/1467-8624.00070.CrossRefPubMedGoogle Scholar
  6. Blandon, A. Y., & Volling, B. L. (2008). Parental gentle guidance and children’s compliance within the family: A replication study. Journal of Family Psychology, 22, 355–366.  https://doi.org/10.1037/0893-3200.22.3.355.CrossRefPubMedPubMedCentralGoogle Scholar
  7. Bocknek, E. L., Brophy-Herb, H. E., & Banerjee, M. (2009). Effects of parental supportiveness on toddlers’ emotion regulation over the first three years of life in a low-income African American sample. Infant Mental Health Journal, 30, 452–476.  https://doi.org/10.1002/imhj.20224.CrossRefPubMedGoogle Scholar
  8. Booth, C. L., Rose-Krasnor, L., McKinnon, J., & Rubin, K. H. (1994). Predicting social adjustment in middle childhood: The role of preschool attachment security and maternal style. Social Development, 3, 189–204.  https://doi.org/10.1111/j.1467-9507.1994.tb00040.x.CrossRefGoogle Scholar
  9. Bradley, R. H., & Corwyn, R. F. (2002). Socioeconomic status and child development. Annual Review of Psychology, 53, 371–399.  https://doi.org/10.1146/annurev.psych.53.100901.135233.CrossRefPubMedGoogle Scholar
  10. Bridgett, D. J., Burt, N. M., Edwards, E. S., & Deater-Deckard, K. (2015). Intergenerational transmission of self-regulation: A multidisciplinary review and integrative conceptual framework. Psychological Bulletin, 141, 602–654.  https://doi.org/10.1037/a0038662.CrossRefPubMedPubMedCentralGoogle Scholar
  11. Bronson, M. B. (2000). Self-regulation in early childhood: Nature and nurture. New York, NY: Guilford Press.Google Scholar
  12. Buckner, J. C., Mezzacappa, E., & Beardslee, W. R. (2003). Characteristics of resilient youths living in poverty: The role of self-regulatory processes. Development and Psychopathology, 15, 139–162.  https://doi.org/10.1017/S0954579403000087.CrossRefPubMedGoogle Scholar
  13. Calkins, S. (1994). Origins and outcomes of individual differences in emotion regulation. In N. A. Fox (Ed.), The development of emotion regulation: Biological and behavioral considerations. Monographs of the Society for Research in Child Development, 59(2–3, Serial No. 240, pp. 53–72).Google Scholar
  14. Calkins, S., & Johnson, M. C. (1998). Toddler regulation of distress to frustrating events: Temperamental and maternal correlates. Infant Behavior and Development, 21, 379–395. doi:10.1016/S0163-6383(98)90015-7.CrossRefGoogle Scholar
  15. Calkins, S. D., Brownell, C. A., & Kopp, C. B. (2007). The emergence of self-regulation: Biological and behavioral control mechanisms supporting toddler competencies. In C. A. Brownell & C. B. Kopp (Eds.), Socioemotional development in the toddler years: Transitions and transformations (pp. 261–284). New York, NY: Guilford Press.Google Scholar
  16. Calkins, S. D., Smith, C. L., Gill, K. L., & Johnson, M. C. (1998). Maternal interactive style across contexts: Relations to emotional, behavioral, and physiological regulation during toddlerhood. Social Development, 7, 350–369.  https://doi.org/10.1111/1467-9507.00072.CrossRefGoogle Scholar
  17. Cecil, C. A., Barker, E. D., Jaffee, S. R., & Viding, E. (2012). Association between maladaptive parenting and child self-control over time: Cross-lagged study using a monozygotic twin difference design. The British Journal of Psychiatry, 201, 291–297.  https://doi.org/10.1192/bjp.bp.111.107581.CrossRefPubMedGoogle Scholar
  18. Cowan, P. A., Cowan, C. P., Pruett, M. K., Pruett, K., & Wong, J. J. (2009). Promoting fathers’ engagement with children: Preventive interventions for low-income families. Journal of Marriage and Family, 71, 663–679.  https://doi.org/10.1111/j.1741-3737.2009.00625.x.CrossRefGoogle Scholar
  19. Conger, R. D., Conger, K. J., & Martin, M. J. (2010). Socioeconomic status, family processes, and individual development. Journal of Marriage and Family, 72, 685–704.  https://doi.org/10.1111/j.1741-3737.2010.00725.x.CrossRefPubMedPubMedCentralGoogle Scholar
  20. Conway, A., & Stifter, C. A. (2012). Longitudinal antecedents of executive function in preschoolers. Child Development, 83, 1022–1036.  https://doi.org/10.1111/j.1467-8624.2012.01756.x.CrossRefPubMedPubMedCentralGoogle Scholar
  21. Coyne, L. W., Low, C. M., Miller, A. L., Seifer, R., & Dickstein, S. (2007). Mothers’ empathic understanding of their toddlers: Associations with maternal depression and sensitivity. Journal of Child and Family Studies, 16, 483–497.  https://doi.org/10.1007/s10826-006-9099-9.CrossRefGoogle Scholar
  22. Crockenberg, S., & Litman, C. (1990). Autonomy as competence in 2-year-olds: Maternal correlates of child defiance, compliance, and self-assertion. Developmental Psychology, 26, 961–971.  https://doi.org/10.1037/0012-1649.26.6.961.CrossRefGoogle Scholar
  23. Dodge, K. A., Pettit, G. S., & Bates, J. E. (1994). Socialization mediators of the relation between socioeconomic status and child conduct problems. Child Development, 65, 649–665.  https://doi.org/10.1111/j.1467-8624.1994.tb00774.x.CrossRefPubMedGoogle Scholar
  24. Eisenberg, N., Cumberland, A., & Spinrad, T. L. (1998). Parental socialization of emotion. Psychological Inquiry, 9, 241–273.  https://doi.org/10.1207/s15327965pli0904_1.CrossRefPubMedPubMedCentralGoogle Scholar
  25. Eisenberg, N., Spinrad, T. L., Eguum, N. D., Silva, K. M., Reiser, M., & Hofer, C., et al. (2010). Relations among maternal socialization, effortful control, and maladjustment in early childhood. Development and Psychopathology, 22, 507–525.  https://doi.org/10.1017/S0954579410000246.CrossRefPubMedPubMedCentralGoogle Scholar
  26. Else-Quest, N. M., Hyde, J. S., Goldsmith, H. H., & Van Hulle, C. A. (2006). Gender differences in temperament: A meta-analysis. Psychological Bulletin, 132, 33–72.  https://doi.org/10.1037/0033-2909.132.1.33.CrossRefPubMedGoogle Scholar
  27. Enders, C. K. (2010). Applied missing data analysis. New York, NY: Guilford Press.Google Scholar
  28. Evans, G. W., & Cassells, R. C. (2013). Childhood poverty, cumulative risk exposure, and mental health in emerging adults. Clinical Psychological Science, 2, 287–296.  https://doi.org/10.1177/2167702613501496.CrossRefPubMedPubMedCentralGoogle Scholar
  29. Forman, D. (2007). Autonomy, compliance and internalization. In C. Brownell & C. Kopp (Eds.), Socio-emotional development in the toddler years: Transitions and transformation (pp. 261–284). NewYork: Guilford Press.Google Scholar
  30. Gallitto, E. (2015). Temperament as a moderator of the effects of parenting on children’s behavior. Development and Psychopathology, 27, 757–773.  https://doi.org/10.1017/S0954579414000753.CrossRefPubMedGoogle Scholar
  31. Garner, P. W., & Spears, F. M. (2000). Emotion regulation in low-income preschoolers. Social Development, 9, 246–264.  https://doi.org/10.1111/1467-9507.00122.CrossRefGoogle Scholar
  32. Gilliom, M., Shaw, D., Beck, J., Schonberg, M., & Lukon, J. (2002). Anger regulation in disadvantaged preschool boys: Strategies, antecedents, and the development of self-control. Developmental Psychology, 38, 222–235.  https://doi.org/10.1037/0012-1649.38.2.222.CrossRefPubMedGoogle Scholar
  33. Gueron-Sela, N., Wagner, N. J., Propper, C. B., Mills-Koonce, W. R., Moore, G. A., & Cox, M. J. (2017). The interaction between child respiratory sinus arrhythmia and early sensitive parenting in the prediction of children’s executive functions. Infancy, 22, 171–189.  https://doi.org/10.1111/infa.12152.CrossRefGoogle Scholar
  34. Kerr, D. C., Lopez, N. L., Olson, S. L., & Sameroff, A. J. (2004). Parental discipline and externalizing behavior problems in early childhood: The roles of moral regulation and child gender. Journal of Abnormal Child Psychology, 32, 369–383.  https://doi.org/10.1023/B:JACP.0000030291.72775.96.CrossRefPubMedGoogle Scholar
  35. Kiff, C. J., Lengua, L. J., & Zalewski, M. (2011). Nature and nurturing: Parenting in the context of child temperament. Clinical Child and Family Psychology Review, 14, 251–301.  https://doi.org/10.1007/s10567-011-0093-4.CrossRefPubMedPubMedCentralGoogle Scholar
  36. Kline, R. B. (2011). Principles and practice of structural equation modeling (3rd ed.). New York, NY: Guilford Press.Google Scholar
  37. Kochanska, G., & Aksan, N. (2006). Children’s conscience and self-regulation. Journal of Personality, 74, 1587–1617.  https://doi.org/10.1111/j.1467-6494.2006.00421.x.CrossRefPubMedGoogle Scholar
  38. Kochanska, G., Coy, K. C., & Murray, K. T. (2001). The development of self-regulation in the first four years of life. Child Development, 72, 1091–1111.  https://doi.org/10.1111/1467-8624.00336.CrossRefPubMedGoogle Scholar
  39. Kochanska, G., Murray, K. T., & Harlan, F. (2000). Effortful control in early childhood: Continuity and change, antecedents, and implications for social development. Developmental Psychology, 36, 220–232.  https://doi.org/10.1037/0012-1649.36.2.220.CrossRefPubMedGoogle Scholar
  40. Kochanska, G., Murray, K., Jacques, T., Koenig, A., & Vandergeest, K. (1996). Inhibitory control in young children and its role in emerging internalization. Child Development, 67, 490–507.  https://doi.org/10.2307/1131828.CrossRefPubMedGoogle Scholar
  41. Kopp, C. B. (1989). Regulation of distress and negative emotions: A developmental view. Developmental Psychology, 25, 343–354.  https://doi.org/10.1037/0012-1649.25.3.343.CrossRefGoogle Scholar
  42. Little, R. J. A., & Rubin, D. B. (1987). Statistical analysis with missing data. New York: Wiley.Google Scholar
  43. Lovejoy, M. C., Graczyk, P. A., O’Hare, E., & Neuman, G. (2000). Maternal depression and parenting behavior: A metal-analytic review. Clinical Psychology Review, 20, 561–592.CrossRefPubMedGoogle Scholar
  44. Martin, A., Razza, R. A., & Brooks-Gunn, J. (2012). Specifying the links between household chaos and preschool children’s development. Early Child Development and Care, 182, 1247–1263.  https://doi.org/10.1080/03004430.2011.605522.CrossRefPubMedGoogle Scholar
  45. Matthews, J. S., Ponitz, C. C., Morrison, F. J., Matthews, J. S., Ponitz, C. C., & Morrison, F. J. (2009). Early gender differences in self-regulation and academic achievement. Journal of Educational Psychology, 101, 689–704.  https://doi.org/10.1037/a0014240.CrossRefGoogle Scholar
  46. McLoyd, V. C. (1998). Socioeconomic disadvantage and child development. American Psychologist, 53, 185–204.  https://doi.org/10.1037/0003-066X.53.2.185.CrossRefPubMedGoogle Scholar
  47. Mendez, J. L., Fantuzzo, J., & Cicchetti, D. (2002). Profiles of social competence among low-income African American preschool children. Child Development, 73, 1085–1100.  https://doi.org/10.1111/1467-8624.00459.CrossRefPubMedGoogle Scholar
  48. Mesman, J., Stoel, R., Bakermans-Kranenburg, M., van IJzendoorn, M. H., Juffer, F., Koot, H. M., & Alik, L. R. A. (2009). Predicting growth curves of early externalizing problems: Differential susceptibility of children with difficult temperament. Journal of Abnormal Child Psychology, 37, 625–636.  https://doi.org/10.1007/s10802-009-9298-0.CrossRefPubMedGoogle Scholar
  49. Miller, A. L., McDonough, S. C., Rosenblum, K. L., & Sameroff, A. J. (2002). Emotion regulation in context: Situational effects on infant and caregiver behavior. Infancy, 3, 403–433.  https://doi.org/10.1207/S15327078IN0304_01.CrossRefGoogle Scholar
  50. Miller, A. L., Rosenblum, K. L., Retzloff, L. B., & Lumeng, J. C. (2016). Observed self-regulation is associated with weight in low-income toddlers. Appetite, 105, 705–712.  https://doi.org/10.1016/j.appet.2016.07.007.CrossRefPubMedPubMedCentralGoogle Scholar
  51. Mistry, R. S., Biesanz, J. C., Taylor, L. C., Burchinal, M., & Cox, M. J. (2004). Economic well-being and children’s social adjustment: The role of family process in an ethnically diverse low-income sample. Child Development, 73, 935–951.  https://doi.org/10.1111/1467-8624.00448.CrossRefGoogle Scholar
  52. Moffitt, T. E., Poulton, R., & Caspi, A. (2013). Lifelong impact of early self-control. American Scientist, 101, 352–359.  https://doi.org/10.1511/2013.104.352.CrossRefGoogle Scholar
  53. Murray, K. T., & Kochanska, G. (2002). Effortful control: Factor structure and relation to externalizing and internalizing behaviors. Journal of Abnormal Child Psychology, 30, 503–514.  https://doi.org/10.1023/A:1019821031523.CrossRefPubMedGoogle Scholar
  54. NICHD Early Child Care Research Network. (2004). Affect dysregulation in the mother-child relationship in the toddler years: Antecedents and consequences. Development and Psychopathology, 16, 43–68.  https://doi.org/10.1017/S0954579404044402.Google Scholar
  55. Newton, E. K., Laible, D., Carlo, G., Steele, J. S., & McGinley, M. (2014). Do sensitive parents foster kind children, or vice versa? Bidirectional influences between children’s prosocial behavior and parental sensitivity. Developmental Psychology, 50, 1808–1816.  https://doi.org/10.1037/a0036495.CrossRefPubMedGoogle Scholar
  56. Parade, S. H., Dickstein, S., Schiller, M., Hayde, L., & Seifer, R. (2015). Stability of child behavioral style in the first 30 months of life. International Journal of Behavioral Development, 39, 121–129.  https://doi.org/10.1177/0165025414538555.CrossRefGoogle Scholar
  57. Ponitz, C. E. C., McClelland, M. M., Jewkes, A. M., Connor, C. M., Farris, C. L., & Morrison, F. J. (2008). Touch your toes! Developing a direct measure of behavioral regulation in early childhood. Early Childhood Research Quarterly, 23, 141–158.  https://doi.org/10.1016/j.ecresq.2007.01.004.CrossRefGoogle Scholar
  58. Posner, M. I., & Rothbart, M. K. (2000). Developing mechanisms of self regulation. Development and Psychopathology, 12, 427–441.CrossRefGoogle Scholar
  59. Putnam, S. P., Gartstein, M. A., & Rothbart, M. K. (2006). Measurement of fine-grained aspects of toddler temperament: The Early Childhood Behavior Questionnaire. Infant Behavior & Development, 29, 386–401.  https://doi.org/10.1016/j.infbeh.2006.01.004.CrossRefGoogle Scholar
  60. Putnam, S. P., Spritz, B. L., & Stifter, C. A. (2002). Mother-child coregulation during delay of gratification at 30 months. Infancy, 3, 209–225.  https://doi.org/10.1207/S15327078IN0302_6.CrossRefGoogle Scholar
  61. Radloff, L. S. (1977). The CES-D Scale: A self-report depression scale for research in the general population. Applied Psychological Measurement, 1, 385–401.  https://doi.org/10.1177/014662167700100306.CrossRefGoogle Scholar
  62. Raikes, H. A., Robinson, J. L., Bradley, R. H., Raikes, H. H., & Ayoub, C. C. (2007). Developmental trends in self-regulation among low-income toddlers. Social Development, 16, 128–149.  https://doi.org/10.1111/j.1467-9507.2007.00375.x.CrossRefGoogle Scholar
  63. Raver, C. C., Blair, C., & Garrett-Peters, P., The Family Life Project Key Investigators. (2014). Chronic exposure to poverty, household chaos, and interparental aggression predict children’s emotion regulation. Development and Psychopathology, 12, 1–14.Google Scholar
  64. Rhoades, B. L., Greenberg, M. T., Lanza, S. T., & Blair, C. (2011). Demographic and familial predictors of early executive function development: Contribution of a person-centered perspective. Journal of Experimental Child Psychology, 108, 638–662.  https://doi.org/10.1016/j.jecp.2010.08.004.CrossRefPubMedGoogle Scholar
  65. Rochette, E., & Bernier, A. (2016). Parenting and preschoolers’ executive functioning: A case of differential susceptibility? International Journal of Behavioral Development, 40, 151–161.  https://doi.org/10.1177/0165025414557370.CrossRefGoogle Scholar
  66. Rodriguez, M. L., Ayduk, O., Aber, L., Mischel, W., Sethi, A., & Shoda, Y. (2005). A contextual approach to the development of self-regulatory competencies: The role of maternal unresponsivity and toddlers’ negative affect in stressful situations. Social Development, 14, 136–157.  https://doi.org/10.1111/j.1467-9507.2005.00294.x.CrossRefGoogle Scholar
  67. Rothbart, M. K., & Bates, J. E. (2006). Temperament. In N. Eisenberg, W. Damon, R. M. Lerner, N. Eisenberg, W. Damon & R. M. Lerner (Eds.), Handbook of child psychology: Vol. 3, Social, emotional, and personality development (6th ed., pp. 99–166). Hoboken, NJ: Wiley.Google Scholar
  68. Roy, A. L., McCoy, D. C., & Raver, C. C. (2014). Instability versus quality: Residential mobility, neighborhood poverty, and children’s self-regulation. Developmental Psychology, 50, 1891–1896.  https://doi.org/10.1037/a0036984.CrossRefPubMedPubMedCentralGoogle Scholar
  69. Rubin, K. H., Burgess, K. B., Dwyer, K. M., & Hastings, P. D. (2003). Predicting preschoolers' externalizing behaviors from toddler temperament, conflict, and maternal negativity. Developmental Psychology, 39, 164–176.  https://doi.org/10.1037/0012-1649.39.1.164.CrossRefPubMedGoogle Scholar
  70. Rutter, M. (2007). Gene–environment interdependence. Developmental Science, 10, 12–18.  https://doi.org/10.1111/j.1467-7687.2007.00557.x.CrossRefPubMedGoogle Scholar
  71. Schiffman, R. F., Omar, M. A., & McKelvey, L. M. (2003). Mother-infant interaction in low-income families. MCN: The American Journal of Maternal/Child Nursing, 28, 246–251.  https://doi.org/10.1097/00005721-200307000-00008.Google Scholar
  72. Song, J.-H., & Volling, B. L. (2015). Coparenting and children’s temperament predict firstborns’ cooperation in the care of an infant sibling. Journal of Family Psychology, 29, 130–135.  https://doi.org/10.1037/fam0000052.CrossRefPubMedPubMedCentralGoogle Scholar
  73. Spinrad, T. L., Stifter, C. A., Donelan-McCall, N., & Turner, L. (2004). Mothers’ regulation strategies in response to toddlers’ affect: Links to later emotion self-regulation. Social Development, 13, 40–55.  https://doi.org/10.1111/j.1467-9507.2004.00256.x.CrossRefGoogle Scholar
  74. Stipek, D., Recchia, S., & McClintic, S. (1992). Self-evaluation in young children. Monographs of the Society for Research in Child Development, 57, 100.  https://doi.org/10.2307/1166190.CrossRefGoogle Scholar
  75. Vernon‐Feagans, L., & Cox, M., FLP Key Investigators. (2013). The Family Life Project: An epidemiological and developmental study of young children living in poor rural communities. Monographs of the Society for Research in Child Development, 78, 1–125.  https://doi.org/10.1111/mono.12047.CrossRefPubMedGoogle Scholar
  76. Wahlsten, D. (1990). Insensitivity of the analysis of variance to heredity-environment interaction. Behavioral and Brain Sciences, 13, 109–161.  https://doi.org/10.1017/S0140525X00077797.CrossRefGoogle Scholar
  77. Zvara, B. J., Mills-Koonce, W. R., Garrett-Peters, P., Wagner, N. J., Vernon-Feagans, L., & Cox, M., The Family Life Project Key Contributors. (2014). The mediating role of parenting in the associations between household chaos and children’s representations of family dysfunction. Attachment & Human Development, 16, 633–655.  https://doi.org/10.1080/14616734.2014.966124.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of PsychologyUniversity of TorontoMississaugaCanada
  2. 2.Center for Human Growth and Development, Department of Health Behavior and Health Education, School of Public HealthUniversity of MichiganAnn ArborUSA
  3. 3.TMW Center for Early Learning + Public HealthUniversity of ChicagoChicagoUSA
  4. 4.Center for Human Growth and Development, Department of Pediatrics, Department of Nutritional Sciences, School of Public HealthUniversity of MichiganAnn ArborUSA
  5. 5.Center for Human Growth and Development, Department of PsychiatryUniversity of MichiganAnn ArborUSA

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