[1] Univ Aldo Moro Bari, Dept Emergency & Organ Transplantat, Bari, Italy
[2] St Vincents Univ Hosp, Ctr Colorectal Dis, Univ Coll Dublin, Dublin, Ireland
[3] Univ Hosp Lausanne, Dept Visceral Surg, Lausanne, Switzerland
[4] Univ Catanzaro, Dept Med & Surg Sci, Catanzaro, Italy
[5] Hosp Univ Mutua Tenassa, Dept Gen Surg, Colorectal Unit, Barcelona, Spain
[6] Krankenhaus Barmherzige Bruner, Dept Proctol, Regensburg, Germany
[7] Univ Vita Salute San Raffaele, Dept Surg, Milan, Italy
[8] Tor Vergata Univ, Dept Surg, Rome, Italy
[9] Med Univ Vienna, Dept Surg, Div Gen Surg, Vienna, Austria
[10] Ist Humanitas Gavazzeni & Castelli, Proctol & Perineol Surg Unit, Bergamo, Italy
[11] Cisanello Univ Hosp, Proctol & Pelv Floor Clin Ctr, Pisa, Italy
[12] Miguel Hernandez Univ, Elche Univ Hosp, Dept Gen Surg, Colorectal Unit, Alicante, Spain
[13] Virgen del Rocio Univ Hosp, Gastrointestinal Surg Dept, Coloproctol Unit, Seville, Spain
[14] IM Sechenov First Moscow State Med Univ, Clin Coloproctol & Minimally Invas Surg, Sechenov Univ, Moscow, Russia
[15] Univ Hosp Geneva, Div Digest Surg, Proctol Unit, Geneva, Switzerland
[16] Amalie Sieveking Hosp, Dept Gen Gastrointestinal & Colorectal Surg, Hamburg, Germany
[17] Santa Rita Clin, Dept Colorectal Surg, Vercelli, Italy
[18] UZ Leuven, Dept Abdominal Surg, Leuven, Belgium
[19] Univ Erlangen Nurnberg, Chirurg Klin, Erlangen, Germany
[20] Creta Interclin Hosp Heraklion, Dept Surg, Iraklion, Greece
[21] Aarhus Univ Hosp, Dept Surg, Aarhus, Denmark
[22] Fdn Policlin Univ A Gemelli IRCCS, Proctol Unit, Rome, Italy
[23] Univ Med Ctr Groningen, Dept Surg, Groningen, Netherlands
[24] Santa Maria dei Battuti Hosp, Dept Surg, Gen Surg Unit, Pordenone, Italy
[25] Univ Paris VII, Beaujon Hosp, AP HP, Dept Colorectal Surg, Clichy, France
[26] Univ Udine, Dept Med, Gen Surg & Transplantat Unit, Udine, Italy
[27] Hosp Univ Vall dHebron, Dept Surg, Barcelona, Spain
[28] Michallon Univ Hosp, Dept Surg, Colorectal Unit, Grenoble, France
[29] Univ Milano Bicocca, Gen Surg Dept, Ist Clin Zucchi, Monza, Italy
[30] Cantonal Hosp Winterthur, Dept Surg, Winterthur, Switzerland
[31] Osped Reg Lugano, Coloproctol Unit, Lugano, Switzerland