[1] Barts Hlth NHS Trust, Dept Gastroenterol, London, England
[2] Queen Mary Univ London, Blizard Inst, Fac Med, Ctr Immunobiol, London, England
[3] Univ Copenhagen, Hvidovre Hosp, Copenhagen Ctr Inflammatory Bowel Dis Children Ado, Gastrounit,Med Div, Copenhagen, Denmark
[4] Mater Dei Hosp, Dept Med, Div Gastroenterol, Msida, Malta
[5] Venizeleio Gen Hosp, Dept Gastroenterol, Iraklion, Greece
[6] Univ Ioannina, Dept Gastroenterol & Hepatol, Div Internal Med, Ioannina, Greece
[7] Med Sch Ioannina, Ioannina, Greece
[8] Univ Vita Salute San Raffaele, Milan, Italy
[9] IRCCS Osped San Raffaele, Dept Gastroenterol & Endoscopy, Milan, Italy
[10] Natl & Kapodistrian Univ Athens, Sotiria Hosp, Acad Dept Internal Med 3, GI Unit, Athens, Greece
[11] Univ Hosp Santiago De Compostela CHUS, Dept Gastroenterol, IBD Unit, Santiago De Compostela, Spain
[12] Kings Coll London, Guys & St Thomas Hosp NHS Fdn Trust, Sch Immunol & Microbiol, Med Eye Unit, London, England
[13] Univ Hosp Lausanne, Zurich Reg Hlth Ctr, Div Gastroenterol & Hepatol, Lausanne, Switzerland
[14] Univ Hosp Zurich, Dept Gastroenterol & Hepatol, Zurich, Switzerland
[15] Queen Mary Univ London, Ctr Cell Biol & Cutaneous Res, Barts & London Sch Med & Dent, Blizard Inst, London, England
[16] Barts Hlth NHS Trust, Royal London Hosp, Dept Dermatol, London, England
[17] Bern Univ Hosp, Clin Visceral Surg & Med, Gastroenterol, Bern, Switzerland
[18] Gastroenterol Beaulieu SA, Crohn & Colitis Ctr, Lausanne, Switzerland
[19] Univ Ghent, Dept Internal Med & Pediat, Ghent, Belgium
[20] Ghent Univ Hosp, Dept Gastroenterol, Ghent, Belgium
[21] Justus Liebig Univ Giessen, Dept Rheumatol & Clin Immunol, Campus Kerckhoff, Bad Nauheim, Germany
[22] Cambridge Univ Hosp NHS Fdn Trust, Cambridge, England
[23] Univ Autonoma Barcelona UAB, Vall dHebron Univ Hosp, Barcelona, Spain
[24] Univ Campania Luigi Vanvitelli, Dept Adv Med & Surg Sci, Naples, Italy
[25] Univ Padua, Dept Surg Oncol & Gastroenterol, Padua, Italy
[26] Azienda Osped Univ Padova, Gastroenterol Unit, Padua, Italy
[27] Univ Med Ctr Hamburg Eppendorf, Dept Internal Med, Hamburg, Germany
[28] Univ Med Ctr Hamburg Eppendorf, Martin Zeitz Ctr Rare Dis, Hamburg, Germany
[29] Univ Med Ctr Hamburg Eppendorf, Hamburg Ctr Translat Immunol HCTI, Hamburg, Germany
[30] Azienda Unita Sanit Locale, Gastroenterol Div, IRCCS, Internal Med Dept, I-42122 Reggio Emilia, Italy
[31] Azienda Unita Sanit Locale, IBD Ctr, Internal Med Dept, IRCCS, I-42122 Reggio Emilia, Italy
[32] Interdisciplinary Crohn Colitis Ctr Rhein Main, Frankfurt, Germany
[33] DGD Clin Sachsenhausen, Dept Gastroenterol & Clin Nutr, Frankfurt, Germany
[34] Hop Henri Mondor, AP HP, Dept Gastroenterol, Creteil, France
[35] Univ Groningen, Univ Med Ctr Groningen, Dept Paediat Gastroenterol, Groningen, Netherlands
[36] Univ Hosp, Dept Gastroenterol & Hepatol, Zurich, Switzerland
[37] Fdn IRCCS Ca Granda Osped Maggiore Policlin, Milan, Italy
[38] Univ Milan, Dept Pathophysiol & Transplantat, Milan, Italy
[39] Univ Lorraine, Vasc Med Div, INSERM, DCAC, Nancy, France
[40] Univ Lorraine, French Referral Ctr Rare Autoimmune Dis, INSERM, DCAC, Nancy, France
[41] CHRU Nancy, Nancy, France
[42] Univ Munster, Luneburg Hosp, Dept Gastroenterol, Luneburg, Germany