[1] Univ Szeged, Ctr Gastroenterol, H-6725 Szeged, Hungary
[2] McGill Univ, Div Gastroenterol, Hlth Ctr, Montreal, PQ H4A 3J1, Canada
[3] Northern Care Alliance NHS Fdn Trust, Manchester M6 8HD, England
[4] Moscow Clin Sci Ctr, Moscow 111123, Russia
[5] Res Inst Hlth Org & Med Management, Moscow 115088, Russia
[6] State Sci Ctr Coloproctol, Moscow 123423, Russia
[7] IRCCS Human Res Hosp, IBD Ctr, I-20089 Milan, Italy
[8] Humanitas Univ, Dept Biomed Sci, I-20072 Milan, Italy
[9] Clin & Res Ctr Inflammatory Bowel Dis, Prague 19000, Czech Republic
[10] Gen Hosp Athens G Gennimatas, Athens 11527, Greece
[11] Irkutsk Reg Hosp, Dept Coloproctol, Irkutsk 664528, Russia
[12] Fed Sci Ctr Surg & Traumatol, Irkutsk 664003, Russia
[13] Azienda Osped Univ Padua, Gastroenterol Unit, Padua, Italy
[14] Univ Padua, Dept Surg Oncol & Gastroenterol, I-35124 Padua, Italy
[15] Univ Naples Federico II, Gastroenterol Dept Clin Med & Surg, I-80131 Naples, Italy
[16] Hungarian Def Forces Mil Hosp, Dept Gastroenterol, H-1062 Budapest, Hungary
[17] ASST Rhodense, Rho Hosp, Gastroenterol Unit, I-20017 Milan, Italy
[18] Clin Hosp 2, Dept Gastroenterol, IBD Unit, Rzeszow, Poland
[19] Copenhagen Univ Hosp Herlev & Gentofte, Dept Gastroenterol & Hepatol, DK-2730 Herlev, Denmark
[20] Univ Hosp Ioannina, Div Gastroenterol, Ioannina 45500, Greece
[21] HCEMM USZ Translat Colorectal Res Grp, H-6725 Szeged, Hungary
[22] Semmelweis Univ, Dept Internal Med & Oncol, H-1085 Budapest, Hungary