[1] Univ Zaragoza, Hosp Univ Lozano Blesa, IIS Arag n, CIBEREHD, Zaragoza, Spain
[2] Agaples Markus Hosp, Dept Med, Willhelm Epstein Straae 4, D-60431 Frankfurt, Germany
[3] Univ Hosp Careggi, Div Gastroenterol, Dept Emergency, Largo Giovanni Alessandro Brambilla, I-50134 Florence, Italy
[4] Med Univ Innsbruck, Dept Internal Med, Anichstrasse 35, A-6020 Innsbruck, Austria
[5] Univ Hosp Leuven & Univ Leuven, Div Gastroenterol & Hepatol, 49 Herestraat, B-3000 Leuven, Belgium
[6] Royal London Hosp, Dept Gastroenterol, Barts Hlth NHS Trust, Whitechapel Rd, London E1, England
[7] Nancy Univ Hosp, Lorraine Univ, Dept Gastroenterol & Inserm U954, 54500 Vandoeuvre Lss Nancy, Nancy, France
[8] St Vincents Univ Hosp, Dept Gastroenterol, Ctr Colorectal Dis, Dublin, Ireland
[9] Mauriziano Hosp, Gastroenterol Unit, Largo Turati 62, I-10128 Turin, Italy
[10] Hosp Luneburg, Dept Internal Med & Gastroenterol, D-21339 Lneburg, Germany
[11] Cleveland Clin Fdn, Lerner Res Inst, Dept Pathobiol NC22, 9500 Euclid Ave, Cleveland, OH 44195 USA
[12] Cleveland Clin Fdn, Digest Dis & Surg Inst, Dept Gastroenterol, Hepatol & Nutr A3, 9500 Euclid Ave, Cleveland, OH 44195 USA
[13] Univ Hosp, Karolinska Inst, IBD unit, Dept Med,Digestive Diseases, Solna, Sweden
[14] Gemelli Hosp Catholic Univ Fdn, Dept Internal Med, IBD Unit Complesso Integrato Columbus, Via Giuseppe Moscati 31, I-00168 Rome, Italy
[15] London & Chelsea & Westminster Hosp, Imperial Coll, 369 Fulham Rd, London SW10 9NH, England
[16] Univ Duisburg Essen, Dept Internal Med & Integrat Gastroenterol, Kliniken Essen Mitte, D-45276 Essen, Germany
[17] Dept Digest Dis, Centro Medico Teknon, Barcelona 08009, Spain
[18] Rambam Hlth Care Campus Rappaport Fac Med, Dept Gastroenterol, 8 HaAliya St,Box 9602, IL-3109601 Haifa, Israel
[19] IRCCS Humanitas Res Hosp, Dept Gastroenterol, IBD Ctr, Via Manzoni,56, I-20089 Rozzano, Italy
[20] Univ Hosp Bern Inselspital, Univ Clin Visceral Surg & Med, Dept Gastroenterol, Freiburgstrasse 10, CH-3010 Bern, Switzerland
[21] Evangelismos Med Ctr, Dept Gastroenterol, 45-47 Ypsilandou St, Athens 10676, Greece
[22] Univ Bologna, IBD Unit, DIMEC, Via Massarenti, I-40138 Bologna, Italy