[1] Akershus Univ Hosp, Dept Gastrointestinal Surg, Lorenskog, Norway
[2] Skane Univ Hosp Malmo, Dept Surg, Colorectal Unit, Malmo, Sweden
[3] Lund Univ, Dept Clin Sci, Malmo, Sweden
[4] BioMed Inst, Colorectal Surg, Genoa, Italy
[5] Univ Bologna, Dept Med & Surg Sci, Bologna, Italy
[6] Univ Barcelona, Bellvitge Univ Hosp, Dept Gen & Digest Surg, Colorectal Unit, Barcelona, Spain
[7] IDIBELL, Barcelona, Spain
[8] Univ Amsterdam, Amsterdam Gastroenterol & Metab, Dept Surg, Amsterdam UMC,Locat AMC, Amsterdam, Netherlands
[9] Uppsala Univ, Vastmanlands Hosp Vasteras, Ctr Clin Res, Colorectal Unit,Dept Surg, Vasteras, Sweden
[10] Meander Med Ctr, Dept Surg, Amersfoort, Netherlands
[11] Univ Med Ctr Groningen, Dept Surg, Groningen, Netherlands
[12] Univ Cologne, Fac Med, Cologne, Germany
[13] Erasmus Univ, Med Ctr, Dept Surg, Rotterdam, Netherlands
[14] Heidelberg Univ, Mannheim Fac Med, Mannheim, Germany
[15] Geneva Univ Hosp, Div Visceral Surg, Geneva, Switzerland
[16] Med Sch, Geneva, Switzerland
[17] Royal Surrey Cty Hosp NHS Trust, Minimal Access Therapy Training Unit Mattu, Guildford, Surrey, England
[18] NU Hosp Grp, Dept Surg, Trollhattan, Region Vastra G, Sweden
[19] Univ Gothenburg, Sahlgrenska Acad, SSORG Scandinavian Surg Outcomes Res Grp, Dept Surg,Inst Clin Sci, Gothenburg, Sweden
[20] Cambridge Univ Hosp NHS Fdn Trust, Addenbrookes Hosp, Cambridge Colorectal Unit, Cambridge, England
[21] Univ Insubria, Univ Hosp Varese, ASST Sette Laghi, Dept Gen Surg, Varese, Italy
[22] Univ Pisa, New Santa Chiara Hosp, Emergency Surg Unit, Pisa, Italy
[23] Vastmanlands Hosp Vasteras, Dept Radiol, Vasteras, Sweden
[24] Uppsala Univ, Vastmanlands Hosp Vasteras, Ctr Clin Res, Vasteras, Sweden
[25] St Vincents Univ Hosp, Dublin, Ireland
[26] Sahlgrens Univ Hosp, Dept Surg, Gothenburg, Region Vastra G, Sweden