Abstract
Background and objective
The aim of this study was to compare the effectiveness of single port/incision laparoscopic surgery (SPILS) with standard three-port laparoscopic surgery for appendicectomy in adults. Feasibility data was collected to evaluate generalizability to other single-port techniques such as cholecystectomy.
Methods
This was a single-center, randomized controlled trial. Participants were randomized to receive either SPILS or standard three-port laparoscopic appendicectomy. The primary patient-reported outcomes were body image and cosmesis at 6 weeks. The primary clinical outcome was pain at 1–7 days. Secondary outcomes included duration of operation, conversion rates, complication rates, use of analgesia, hospital re-admission rates, re-operation rates, and time to return to normal activities.
Results
Seventy-nine patients were randomized. Sixty-seven completed the day 1–7 diary and 53 completed the 6-week follow-up. SPILS patients answered significantly more favorably to the items in the body image scale [mean (SD) 5.6 (1.0) vs. 7.0 (3.3); −1.4 (95 % CI −2.8 to 1.5; p = 0.03)] and the cosmetic scale [18.9 (4.1) vs. 15.3 (5.8); 3.6 (95 % CI 0.7–6.5; p = 0.016)] compared with patients in the Standard group. The duration of operation was shorter for SPILS, and patients required less morphine in recovery; however, there were no statistically significant differences in other outcomes.
Conclusions
Patient-reported body image and cosmesis outcomes were better, and surgical outcomes were similar following SPILS. However, the SPILS procedure is more technically demanding and may not be achievable or necessary in routine clinical care. Further assessment of the findings is needed through larger multicenter studies.
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Laparoscopic surgery is the preferred approach for many abdominal procedures because of reduced postoperative pain, more rapid recovery, and improved cosmesis which follows a successful operation compared with a conventional single large incision. Whilst the long-term clinical result may be similar [1], the perception amongst many patients and surgeons of the advantage in terms of these short-term outcomes is a powerful influence on practice. There are continuing developments to laparoscopic surgery to reduce the size, number, and placement of incisions to both improve the cosmetic appearance and reduce abdominal wall trauma.
One of the recent innovations is single port/incision laparoscopic surgery (SPILS). This can be either insertion of multiple ports through a small incision or through a proprietary device with multiple channels. The fundamental difference to conventional multi-port laparoscopic surgery is to place all the ports through a single incision which, when sited in the umbilicus, can result in no visible scar in the abdominal wall.
The current literature largely comprises case reports and small series detailing single-port methods. The technique has been used to perform a large variety of procedures, including appendicectomy, cholecystectomy, nephrectomy, hysterectomy, oophorectomy, adrenalectomy, gastric bypass, Nissen fundoplication, hernia repair, splenectomy, colon resection, and liver resection. Apart from a handful of reported randomized controlled trials (RCTs), [2–6], the evidence base is insufficient to inform practice and robustly assess claims of reduced pain and morbidity with improved cosmesis and faster recovery [7–12]. In general, it is perceived that the single port/incision technique takes longer than conventional laparoscopic surgery and the differences in costs and safety are unknown.
Nevertheless, there has been considerable interest in introducing single port/incision surgery, and a large number of training courses are available. The public perception is that it might become the procedure of choice if it becomes widely available [13]. It is crucial that the technique be critically evaluated during the introductory phase of implementation to provide robust data to inform further adoption and evaluation. However, the difficulty of undertaking such an evaluation has been succinctly stated in Buxton’s law: “It is always too early (for rigorous evaluation) until, unfortunately, it’s suddenly too late” [14]. Ideally, a definitive evaluation requires a large, multicenter RCT. Despite the recent publication of clinical trials in appendicitis [15, 16] and observational studies [17], there remains a paucity of data to help plan and design a large RCT or justify widespread adoption of SPILS. Additionally, further refinement of the single port/incision technique is needed.
The aim of this study was to compare the effectiveness of single port/incision laparoscopic appendicectomy with standard three-port laparoscopic appendicectomy in adult patients at 6 weeks post-surgery. Appendicectomy was the focus of this study because it is a common and relatively simple procedure to undertake. Feasibility data were collected to evaluate generalizability to other more complex single-port techniques such as cholecystectomy.
Material and methods
Ethical approval was given by the North of Scotland Research Ethics Committee (REC reference number 10/S0802/77). Adult patients aged over 16 years presenting with suspected appendicitis for whom laparoscopic surgical management was judged appropriate were eligible for the trial. Patients were identified in the General Surgery Units, Aberdeen Royal Infirmary (UK), by the consultant or designated team member. Patients who had previous open abdominal surgery through midline incision or previous umbilical hernia repair with mesh were excluded. Participants were randomized to receive SPILS or standard surgery in equal proportion using the randomization application at the trial office at the Centre for Healthcare and Randomised Trials (CHaRT), Aberdeen. Randomization was by computer-generated permuted blocks of size two and four and stratified by gender. Because of the acute nature of the admission to surgery and potential difficulty in tracking patients, date of birth was also recorded and used in addition to the study number to identify patients.
The surgical interventions were delivered or supervised by a surgeon who had expertise in the specific intervention. A standard anesthetic regimen and pain-relief policy was followed, where possible. Ports sites of 10 mm and over were closed with absorbable sutures before closing the skin. The two interventions being compared were:
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(1)
Single-port laparoscopic (SPILS) surgery A single intra-umbilical incision was made and a multi-channel port inserted. A 5 mm, 30 degree telescope was used to visualize the operative field. Conventional laparoscopic instruments were used for the procedure. Roticulating/curved instruments were available and used if required. Use of any additional instruments or ports was recorded for cost analysis.
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(2)
Standard three-port laparoscopic surgery Pneumoperitoneum was established by an open technique through an intra/supraumbilical incision with a 10–12 mm port for initial pneumoperitoneum and inspection. A further 5 or 10 mm port was used in the left iliac fossa (depending on the availability of 5 mm laparoscopes) and a 5 mm port inserted in the hypogastrium. Standard laparoscopic instruments were used for the procedure as per existing hospital protocol.
Outcomes
The primary patient-reported outcome (PRO) measure was patient-reported cosmesis and body image using the Body Image Questionnaire (BIQ) [18] at 6 weeks. The primary clinical outcome was severity of pain using the pain Numerical Rating Scale (NRS) at 1–7 days. Other PROs included the Hospital Experience Questionnaire (HEQ) [18], analgesic usage, and time to return to normal activities. Other clinical outcomes included analgesic use, duration of operation (minutes) and complication rates, conversion rates, infection rates (intra-abdominal and wound), related hospital re-admission rates up to 6 weeks, re-operation rates and port-site hernia up to 6 weeks. In addition, the following feasibility measures were collected: eligible patients per month, proportion formally considered for trial entry, proportion randomized (and reasons why not), proportion who were unaware of their received intervention at 24 h, proportion of those recruited with a complete data set at 6 weeks, surgeon’s perception of SPILS approach and the suitability of available equipment. Resource-use data was limited to operative time, theatre time, and length of stay.
Data collection and processing
Participants were assessed pre-operatively to confirm eligibility, and perioperative data was collected. PROs were collected by diary completed on days 1–7 following surgery and by postal questionnaires at 6 weeks post surgery. Patients were not reviewed post-discharge unless there was a clinical indication following current clinical practice.
Sample size
As there were no published RCTs upon which to base it, a formal sample size calculation based upon previous data was not possible. A sample of 80 participants recruited over the 7-month recruitment phase was anticipated. Adopting a 5 % two-sided significance level, this would allow an effect size (Cohen’s d) of 0.65 to be detected with 80 % power for patient-reported measures such as the BIQ [equivalent to mean difference of 1.8 based upon standard deviation (SD) of 2.8].
Statistical analyses
Data was described using number and percentage, mean and SD, or median and interquartile range (IQR) as appropriate. All estimates of intervention are presented with 95 % confidence intervals (CIs). Dichotomous variables were analysed using Fisher’s exact test and 95 % CIs derived using Newcombe’s method [19]. Categorical data were analysed using a χ 2 test for trend [20]. Continuous data were analysed using t tests. Pain data from day 1 to 7 were converted to an area under the curve (AUC) and reported and analysed as a continuous outcome, and summarized graphically. For feasibility measures, such as the proportion of eligible patients who consent to randomization, the frequency was calculated. All analyses were by intention-to-treat on complete cases only and software used was Stata 12 [21].
Results
Recruitment began on 8 January 2011 and concluded on 16 September 2011. A total of 233 adult patients aged 16 years or over presented with suspected acute appendicitis. Eighty-seven patients were formally approached; of these, three patients were ineligible due to previous open abdominal surgery through midline incision and three patients were unable to consent. Seventy-nine patients were eligible and agreed to take part in the study, and were randomized to SCARLESS (see CONSORT diagram, Fig. 1); 39 patients were allocated to the SPILS group and 40 patients were allocated to the Standard group. Two patients in the Standard group underwent surgery other than appendicectomy (one patient underwent surgery for a perforated sigmoid colon; one patient underwent a cholecystectomy) and therefore were regarded as post-randomization exclusions and were not included in the statistical analyses. Baseline characteristics were generally well balanced in terms of age, gender, American Society of Anesthesiologists (ASA) grade and body mass index (BMI) (Table 1).
For the majority of patients in both groups, the main surgery was undertaken by a junior or senior trainee surgeon—31 (79 %) and 35 (92 %) for the SPILS and Standard groups, respectively; a consultant surgeon was present in five (13 %) of the SPILS operations and three (8 %) of the Standard operations. Only three patients in the SPILS group were operated on by a consultant surgeon (Table 2). The vast majority of patients in both groups received their allocated intervention—33 (85 %) and 34 (89 %) for the SPILS and Standard groups, respectively. Three patients in the SPILS group required an additional port, two patients underwent standard three-port laparoscopic surgery, and one patient was converted to an open operation. In the Standard group, two patients required an additional port and two patients were converted to an open operation.
There were four cases of intraoperative complications in three patients allocated to the Standard group—two cases of bleeding, and two reported injuries to the abdominal viscera. Intraoperative complications have been summarized in Table 3. There were few cases of postoperative complications in both groups, with three (8 %) patients in the SPILS group experiencing at least one complication compared with five (13 %) in the Standard group. The most common postoperative complication was surgical site infection, with two (5 %) and three (8 %) cases for the SPILS and Standard groups, respectively. Three participants required a re-operation: in one patient with a retrocaecal-subhepatic appendix abscess undergoing SPILS, despite the insertion of a supplementary port the appendix was thought to have been excised but a second operation was required 3 days later to remove the appendix; one patient in the Standard group required a re-operation due to bowel injury and the other had a re-operation for a pelvic abscess. These complications and re-operations are summarized in Table 3.
On average, SPILS was quicker than standard surgery, with the total operation time being 15 min shorter (95 % CI 0–28; p = 0.048; Table 2). Other resource-use outcomes are detailed in Table 4. The hospital re-admission rate was higher in the Standard group. Length of hospital stay was similar in both groups, as was return to normal activities.
Morphine use during immediate recovery was less in participants in the SPILS group than in the Standard group—16 (41 %) versus 29 (76 %), respectively [difference −35 % (95 % CI −53 to −13); p = 0.003]. Morphine dose received was similar in both groups when given. During immediate recovery, 26 (67 %) participants in the SPILS group versus 32 (84 %) in the Standard group required paracetamol—17 % less (95 % CI −2 to 35; p = 0.097). There were no differences in the use of postoperative analgesia on the ward. Similarly, there was no statistical difference in patient-reported pain on days 1–7 (Table 5; Figs. 2, 3).
Twenty-one (75 %) patients in the SPILS group compared with 14 (56 %) patients in the Standard group considered their stay in hospital to be ‘not too long, not too short’. However, eight (32 %) patients in the Standard group thought that their stay was ‘a little bit too short’ compared with three (11 %) in the SPILS group. The difference between groups was not statistically significant. Overall, the majority of patients in both groups indicated that their treatment in hospital was ‘good’ or ‘very good’—27 (96 %) in the SPILS group compared with 19 (76 %) in the Standard group (p = 0.012). There were no statistically significant differences in pain after the operation or length of time taken to eat normally (reported at 6 weeks). The HEQ has been summarized in Table 6.
At 6 weeks’ follow-up, patients in the SPILS group answered the items in the BIQ significantly more favorably: body image score [mean (SD)] 5.6 (1.0) versus 7.0 (3.3) for the SPILS and Standard groups, respectively; difference in means −1.4 (95 % CI −2.8 to 1.5; p = 0.03). The cosmetic score was also answered significantly more favorably in the SPILS group; mean difference 3.6 (95 % CI 0.7–6.5; p = 0.016). However, there were no differences in postoperative self-confidence [7.9 (1.8) vs. 7.1 (2.7); see Table 7].
No statistically significant differences in self-reported pain were detected between groups at 6 weeks: mean (SD) pain when resting 0.3 (0.5) in the SPILS group versus 0.4 (0.8) in the Standard group, difference in means −0.1 (95 % CI −0.5 to 0.2; p = 0.46); pain when moving 0.4 (0.7) versus 0.6 (1), difference in means −0.2 (95 % CI −0.7 to 0.3; p = 0.47) [Table 7].
Feasibility measures
The proportion of potentially eligible patients recruited to the study was 79/233 (34 %), which represented a rate of approximately eight per month (Fig. 1). A substantial proportion of patients were not approached or assessed for eligibility due to the emergency setting of treatment in this study. Reasons included lack of awareness of the study amongst surgical teams due to frequent staff rotations, reluctance of trainee surgeons to recruit due to perceived threat to surgical training, reluctance of consultants to participate because of an unknown safety profile or due to time pressure, and non-availability of a surgeon with expertise in SPILS. It was intended to train all participating surgeons in both techniques but in the event this proved impractical and the majority of SPILS procedures were performed by senior surgical trainees, whereas the standard three-port surgery was performed by surgeons at differing levels of expertise. Only 15 (38 %) surgeons in the SPILS group rated the operation as straightforward compared with 20 (53 %) in the Standard group, with more surgeons rating the operation as moderately difficult [11 (28 %)], or extremely difficult [6 (15 %)] compared with 9 (24 %) and 2 (5 %) for Standard three-port surgery (Table 2). Blinding of participants to the allocation by the use of bandages was abandoned after seven participants due to the difficulties in preventing details of the surgery being communicated to the patients by medical staff not directly involved in the study. As a consequence, the proportion unaware of their received intervention at 24 h was not available. The number of completed 6-week questionnaires and full datasets were 53 (67 %) and 51 (65 %) respectively. Apart from the availability of a multichannel port and 5 mm laparoscope no additional equipment was required to deliver SPILS for appendicectomy.
Discussion
The SCARLESS study has shown that patient-reported pain and resource-use outcomes were similar, and patient-reported body image possibly better, following SPILS when compared with Standard three-port laparoscopic appendicectomy. This was achieved in an emergency setting in a single teaching hospital where special arrangements for surgical cover had to be adopted, due to the innovative nature of SPILS, to facilitate the conduct of the trial. Such arrangements are unlikely to reflect actual care if SPILS were to be routinely adopted in preference to a Standard three-port laparoscopic procedure. The reduced surgical access and visualization of a single-port approach may compromise patient safety, as in the case where the appendix was not removed and a second operation was required. Therefore, further assessment of the relative merits of the procedures is needed through larger multicenter studies. However, there are a number of practical challenges to conducting such studies in a way that provides generalizable findings.
In SCARLESS, the SPILS procedure was carried out by surgeons with expertise in the conventional three-port laparoscopic procedure and had been trained to undertake SPILS. The shorter operating time observed in SCARLESS may be due to more experienced surgeons in the SPILS group or due to the lack of time and opportunity to extend SPILS training to all the junior staff. Due to the nature of appendicectomy, as one of the general surgical operations that form part of surgical training, the greater number of surgeons with a wider range of experience who delivered the three-port procedure limits the generalizability of the study findings. Successful completion of the operation was similar, although more cases required modification of the initial approach following SPILS, whether through use of an additional port or conversion to open surgery.
Patient-reported pain was similar between groups. There appeared to be slightly less pain following SPILS; however, this was not statistically significant. The SPILS group required less morphine in recovery with a lower, although not statistically significant, intensity post-operative analgesia following initial recovery prior to discharge. Body image data favored SPILS, with a statistically significant difference for two of three outcomes, although it is uncertain how important such differences are to patients. A general favoring of SPILS from a patient perspective is not surprising if other outcomes were at least as good. This was observed in a recent survey of patient preferences [22].
A recently published systematic review identified a number of studies that had assessed single-port appendicectomy; however, the vast majority were uncontrolled (case series) studies [17]. Two RCTs have been published comprising 40 patients [15] and 360 patients [16]. In general, these showed similar outcomes for the two procedures, although, in contrast to SCARLESS, both had a shorter operation time for the three-port procedure. However, the differences in operation time for all RCTs, including SCARLESS, were not of a magnitude that would clinically have much consequence. A handful of observational studies also reported similar findings [17].
Recruitment was relatively fast and in keeping with expectation. However, this masked the practical challenges of conducting a randomized trial in an emergency setting where multiple surgical teams utilize the same facilities in a fluid process. The acute nature of the admission to surgery made it difficult to track and consent potential participants. A proportion of cases required treatment out with regular hours. Another problem related to the reluctance of some surgical staff to pass on information about potential eligibility due to concerns over safety and the perceived threat to their surgical training. In addition to the study’s surgical investigators, a part-time research nurse was involved in the recruitment process, which was highly beneficial. However, without full-time dedicated recruitment staff, improved rate of assessment for recruitment would be unlikely in the hectic context of an acute surgical unit. Subsequent in-patient follow-up of participants was also difficult, some moving wards multiple times; this was reflected in the completeness of the dataset. Return of the 6-week questionnaire was also relatively low despite the use of reminders, possibly reflecting the demographics of the participants, who were a young and active group.
We abandoned our attempt to blind participants part way through the study due to impracticality, both in applying three dressings to all patients and in preventing knowledge of surgery being communicated by medical staff not directly involved in the study. As such, participant perceptions, possibly influenced by medical staff, could have influenced patient-reported pain. Nevertheless, the findings are consistent with intuitive expectation that, other things being equal, participants would prefer SPILS if surgical outcomes were at least similar. Furthermore, the usage of morphine was lower following SPILS, which could be seen as a ‘stronger’ sign of a genuine reduction in pain.
References
Jayne DG, Guillou PJ, Thorpe H, Quirke P, Copeland J, Smith AMH (2007) Randomized trial of laparoscopic-assisted resection of colorectal carcinoma: 3-year results of the UK MRC CLASICC Trial Group. J Clin Oncol 25:3061–3068
Lee PC, Lo C, Lai PS, Chang JJ, Huang SJ, Lin MT (2010) Randomized clinical trial of single-incision laparoscopic cholecystectomy versus mini-laparoscopic cholecystectomy. Br J Surg 97:1007–1012
Tsimoyiannis EC, Tsimogiannis KE, Pappas-Gogos G, Farantos C, Benetatos N, Mavriduo P (2010) Different pain scores in single transumbilical incision laparoscopic cholecystectomy versus classic laparoscopic cholecystectomy: a randomized controlled trial. Surg Endosc 24:1842–1848
Tugcu V, Ilbey YO, Mutlu B, Tasci AI (2010) Laparoendoscopic single-site surgery (LESS) versus standard laparoscopic simple nephrectomy: a prospective randomized study. J Endourol 24:1315–1320
Marks J, Tacchino R, Roberts K, Onders R, Denoto G, Paraskeva P et al (2011) Prospective randomized controlled trial of traditional laparoscopic cholecystectomy versus single-incision laparoscopic cholecystectomy: report of preliminary data. Am J Surg 201:369–372
Asakuma M, Hayashi M, Komeda K, Shimizu T, Hirokawa F, Miyamoto Y et al (2011) Impact of single port cholecystectomy on post operative pain. Br J Surg 98:991–995
Pappalepore N (2002) Transumbilical laparoscopic-assisted appendectomy (TULAA): a safe and useful alternative for uncomplicated appendicitis. Eur J Pediatr Surg 12:383–386
Meyer A, Preuss M, Roesler S, Lainka M, Omlor G (2004) Transumbilical laparoscopic-assisted ‘‘one-trocar’’ appendectomy—TULAA—as an alternative operation method in the treatment of appendicitis [in German]. Zentralbl Chir 129:391–395
Ateş O (2007) Single-port laparoscopic appendectomy conducted intracorporeally with the aid of a transabdominal sling suture. J Pediatr Surg 42:1071–1074
Roberts KE (2009) True single-port appendectomy: first experience with the puppeteer technique. Surg Endosc 23:1825–1830
Hong TH (2009) Transumbilical single-port laparoscopic appendectomy (TUSPLA): scarless intracorporeal appendectomy. J Laparoendosc Adv Surg Tech A 19:75–78
Bucher P, Pugin F, Buchs N, Ostermann S, Charara F, Morel P (2009) Single port access laparoscopic cholecystectomy (with video). World J Surg 33:1015–1019
Ahsan R, Kynaston J, MacDonald ER, Ahmed I (2010) Patient preferences for surgical techniques: should we invest in new approaches? Surg Endosc 24:3016–3025
Buxton MJ (1987) Problems in the economic appraisal of new health technology: the evaluation of heart transplants in the UK. In: Drummond MF (ed) Economic appraisal of health technology in the European Community. Oxford Medical Publications, Oxford, pp 103–118
Park JH, Hyun KH, Park CH, Choi SY, Choi WH, Kim DJ (2010) Laparoscopic vs transumbilical single-port laparoscopic appendectomy: results of prospective randomized trial. J Korean Surg Soc 78:213–218
St Peter S, Adibe OO, Juuang D, Sharp SW, Garey CL, Laituir CA et al (2011) Single incision versus standard 3-port laparoscopic appendectomy: a prospective randomised trial. Ann Surg 254:586–590
Rehman H, Rao AM, Ahmed I (2011) Single incision versus conventional multi-incision appendicectomy for suspected appendicitis. Cochrane Database Syst Rev (7): CD009022
Dunker MS, Stiggelbout AM, van Hogezand RA, Ringers J, Griffioen G, Bemelman WA (1998) Cosmesis and body image after laparoscopic-assisted and open ileocolic resection for Crohn’s disease. Surg Endosc 12:1334–1340
Newcombe R (1998) Interval estimation for the difference between independent proportions: comparison of eleven methods. Stat Med 17:873–890
Cuzick J (1985) A Wilcoxon-type test for trend. Stat Med 4:87–90
StataCorp (2011) Stata statistical software: release 12. StataCorp LP, College Station
Rao A, Kynaston J, MacDonald ER, Ahmed I (2010) Patient preferences for surgical techniques: should we invest in new approaches? Surg Endosc 12:3016–3025
Acknowledgments
The authors thank John Norrie for advice regarding the reporting of the study, and clinical staff in the Department of General Surgery, Aberdeen Royal Infirmary, for helping with the conduct of the study. This work was supported by a Grant from the Chief Scientist Office (CSO) of the Scottish Government Health Directorates (Grant Number reference CZG/2/498). Jonathan A. Cook held a Medical Research Council, UK, training fellowship (G0601938) while this research was undertaken. The Health Services Research Unit is funded by the CSO of the Scottish Government Health Directorates. The views expressed in this paper are those of the authors and may not necessarily be shared by the funding bodies. The study was overseen by an Advisory Group comprising Professor Marion Campbell (Director, Health Services Research Unit, Aberdeen), Professor John Norrie (CHaRT Director) and Professor Craig Ramsay (Health Care Assessment Programme Director, Health Services Research Unit, Aberdeen). Professor W. Alastair Chambers was the independent chair of the Trial Steering Committee. Contributing surgeons to the SCARLESS study (in alphabetical order): Bassam Alkari, Emad Aly, Norman Binnie, Duff Bruce, Jan Jansen, Peter King, Tim MacAdam, Aileen McKinley, Terry O’Kelly, Ken Park, Abdul Qadir. The National Health Service provided support through the contribution of the following research nurses: Anu Joyson, Hazel Forbes, and Julie Shotton.
Disclosures
Mr Irfan Ahmed, Professor Zygmunt H. Krukowski and Drs. Jonathan A. Cook, Anne Duncan, Momin Malik, Graeme MacLennan, and Kirsty McCormack have no conflicts of interest or financial ties to disclose.
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Additional information
The members of the SCARLESS Study Group are collaborators of the study.
The members of this article are given in Appendix
Appendix
Appendix
SCARLESS Group (in alphabetical order)
Mr Irfan Ahmed, Department of Surgery, Aberdeen Royal Infirmary; Dr Jennifer Burr, Mrs Mayret Castillo, Ms Diane Collins, Dr Jonathan A. Cook, Professor Marion Campbell, Dr Anne Duncan, Health Services Research Unit, University of Aberdeen; Mrs Anu Joyson, Professor Zygmunt H. Krukowski, Dr Momin Malik, Department of Surgery, Aberdeen Royal Infirmary; Dr Kirsty McCormack, Mrs Alison McDonald, Mr Graeme MacLennan, Dr Gladys McPherson, Mrs Christiane Pflanz-Sinclair, Professor Craig Ramsay, Health Services Research Unit, University of Aberdeen.
Writing Committee (alphabetical order)
Mr Irfan Ahmed, Department of Surgery, Aberdeen Royal Infirmary; Dr Jonathan A Cook, Health Services Research Unit, University of Aberdeen; Dr Anne Duncan Health Services Research Unit, University of Aberdeen; Zygmunt H Krukowski, Department of Surgery, Aberdeen Royal Infirmary; Dr Momin Malik, Department of Surgery, Aberdeen Royal Infirmary; Mr Graeme MacLennan, Health Services Research Unit, University of Aberdeen; Dr Kirsty McCormack, Health Services Research Unit, University of Aberdeen.
Advisory Group
Dr Jennifer Burr, Professor Marion Campbell, Professor Craig Ramsay, Professor John Norrie, Health Services Research Unit, University of Aberdeen.
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The SCARLESS Study Group. Single port/incision laparoscopic surgery compared with standard three-port laparoscopic surgery for appendicectomy: a randomized controlled trial. Surg Endosc 29, 77–85 (2015). https://doi.org/10.1007/s00464-014-3416-y
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DOI: https://doi.org/10.1007/s00464-014-3416-y