[1] Hull & East Yorkshire Hosp NHS Trust, Surg Hlth Care Grp, Kingston Upon Hull, N Humberside, England
[2] Ist Clin Cita, Dept Emergency, Milan, Italy
[3] Humanitas Res Hosp, Emergency Surg & Trauma Unit, Rozzano, Italy
[4] Osped Legnano, Dept Gen Surg, Milan, Italy
[5] Hosp Univ Torrevieja, Serv Cirugia Gen & Digest, Torrevieja, Spain
[6] Surg 1 Tondela Viseu Hosp Ctr, Viseu, Portugal
[7] Milton Keynes Hosp NHS Fdn Trust, Dept Surg, Milton Keynes, Bucks, England
[8] Johannes Kepler Univ Linz, Clin Linz, Dept Surg 2, A-4040 Linz, Austria
[9] Mafraq Hosp, Div Trauma & Acute Care Surg, Abu Dhabi, U Arab Emirates
[10] Univ Hosp Torrevieja, Dept Angiol & Vacular Surg, Torrevieja, Spain
[11] Ctr Hosp Vila Nova De Gaia Espinho, Dept Gen Surg, Vila Nova De Gaia, Portugal
[12] Santo Andre Hosp, Dept Surg 2, Leiria, Portugal
[13] Hosp Galdakao Usansolo, Serv Cirugia Gen & Digest, Vizcaya, Spain
[14] Hacettepe Univ, Sch Med, Dept Surg, TR-06100 Ankara, Turkey
[15] Hosp Sao Teotonio, Dept Gen Surg, Viseu, Portugal
[16] Maastricht Univ, Med Ctr, Dept Surg Intens Care Med, NL-6200 MD Maastricht, Netherlands
[17] Rhodes Gen Hosp, Dept Gen Surg, Rhodes, Greece
[18] Univ Gen Hosp Gregorio Maranon, Gen Surg & Emergency Surg 2, Madrid, Spain
[19] Galdakao Usansolo Hosp, Dept Surg, Galdakao, Vizcaya, Spain
[20] Univ Bergen, Dept Clin Med, Bergen, Norway
[21] Stavanger Univ Hosp, Dept Gastrointestinal Surg, Stavanger, Norway
[22] Istanbul Univ, Istanbul Fac Med, Dept Gen Surg, Istanbul, Turkey