[1] Univ Coll London Hosp, Abdominal Wall Unit, 235 Euston Rd, London, England
[2] UCL Centre Med Imaging, 2nd floor Charles Bell House, 43-45 Foley St, London, England
[3] Univ Texas Hlth Sci Ctr, McGovern Med Ctr, Dept Surg, 5656 Kelley St, Houston, TX 77026 USA
[4] Maria Middelares Hosp, Dept Surg, Buitenring-Sint-Denijs 30, B-9000 Ghent, Belgium
[5] Johns Hopkins Univ Hosp, Div Minimally Invas Surg, 600 N Wolfe St Blalock 618, Baltimore, MD 21287 USA
[6] Groote Schuur Hosp, Colorectal Unit, Main Rd, Observ, ZA-7925 Cape Town, South Africa
[7] Royal Infirm Edinburgh NHS Trust, Dept Surg, Edinburgh, Scotland
[8] Kantonal Hosp Olten, Dept Visceral Vasc & Thorac Surg, Baselstrasse 150, CH-4600 Olten, Switzerland
[9] Mt Sinai Sch Med, Dept Gen Surg, Dept Surg, New York, NY 10029 USA
[10] Stanford Univ Med Ctr, Dept Surg, 300 Pasteur Dr, Palo Alto, CA 94304 USA
[11] Carolinas Med Ctr, Dept Surg, Div Gastrointestinal & Minimally Invas Surg, 1000 Blythe Blvd, Charlotte, NC 28203 USA
[12] Univ Ulsan, Asan Med Ctr, Dept Plast Surg, 88 Oympicro, 43gil Songpagu, Seoul, South Korea
[13] Macquarie Univ Hosp, Macquarie Univ, Dept Gen Surg, 3 Technol Pl, Sydney, NSW 2109, Australia
[14] Boston & Harvard Univ, Vet Affairs Boston Hlth Care Syst, Dept Gen Surg, 1400 VFW Parkway, W Roxbury, MA 02132 USA
[15] Bispebjerg Hosp, Digest Dis Ctr, Bispebjerg Bakke 23, DK-2400 Copenhagen, Denmark
[16] Skane Univ Hosp Malmo, Dept Surg, S-202 05 Malmo, Sweden
[17] Univ Hosp Virgen Rocio, Dept Gen & Digest Surg, Unit Innovat Minimally Invas Surg, Betis-65, 1, E-41010 Seville, Spain
[18] Robert Debre Univ Hosp, Univ Reims Champagne & Ardenne, Dept Gen Digest & Endocrine Surg, Rue Cognacq-Jay, F-51092 Reims, France
[19] North Devon Dist Hosp, Dept Gen & Upper GI Surg, Raleigh Pk, Barnstaple, Devon, England
[20] Royal Devon & Exeter Hosp, Exeter Surg Hlth Serv Res Unit HeSRU, Barrack Rd, Exeter EX2 5DW, Devon, England
[21] Univ Hosp Wales, Dept Colorectal Surg, Cardiff CF14 4XW, England