[1] Univ Cagliari, Univ Hosp Policlin Duilio Casula, Dept Emergency Surg, Azienda Osped, Cagliari, Italy
[2] Univ Campania Luigi Vanvitelli, Naples, Italy
[3] Univ Hosp Vall Hebron, Colorectal Unit, Barcelona, Spain
[4] Pisa Univ Hosp, Gen Emergency & Trauma Surg, Pisa, Italy
[5] Ist Ric Farmacol Mario Negri IRCCS, Milan, Italy
[6] Univ Hosp Varese, Dept Gen Surg, Varese, Italy
[7] Nicola Giannettasio Hosp, Gen Surg Unit, Corigliano Rossano, Italy
[8] Hosp Mar, HPB Surg Unit, Barcelona, Spain
[9] Osped Niguarda Ca Granda, Trauma & Acute Care Surg Unit, Milan, Italy
[10] Royal Infirm Edinburgh NHS Trust, Dept Upper GI Surg, Edinburgh, Midlothian, Scotland
[11] Univ Cambridge, Addenbrookes Hosp, Dept Surg, Cambridge, England
[12] Univ Roma La Sapienza, Policlin Univ Umberto I, Dept Gen & Specialized Surg Paride Stefanini, Rome, Italy
[13] Univ Naples Federico II, Dept Publ Hlth, Naples, Italy
[14] Univ Chicago, Dept Surg, Transplant Div, Chicago, IL USA
[15] Vittorio Veneto Civil Hosp, Dept Surg, Vittorio Veneto, Italy
[16] Macerata Hosp, Dept Surg, Macerata, Italy
[17] Univ Helsinki, Abdominal Ctr, Dept Abdominal Surg, Helsinki, Finland
[18] Helsinki Univ Cent Hosp, Helsinki, Finland
[19] Div Gen Surg, Rambam Hlth Care Campus, Haifa, Israel
[20] Maggiore Hosp Parma, Emergency & Trauma Surg Dept, Parma, Italy