M. Piqueras¹, A. Jauregu², M. Barreiro³, M. Iborra⁴, I. Bermell⁵, D. Carpio⁶, M. Chaparro⁷, A. Villoria⁸, T. Lobaton⁹, M. Calvo¹⁰, A. Fernandez¹¹, S. Garcia-Moran¹², D. Monfort¹, R. Mena¹, Y. Zabana¹³, ¹Consorci Sanitari de Terrassa (CST), Gastroenterology department, Terrassa (Barcelona), Spain, ²Hospital Clinic Barcelona, Spain, ³Hospital Santiago de Compostela, Spain, ⁴Hospital la Fe de Valencia, Spain, ⁵Hospital Dr Negrin, Spain, ⁶Compejo Hospitalario de Pontevedra, Spain, ⁷Hospital La Princesa, Spain, ⁸Corporacio Sanitaria Parc Tauli, Spain, ⁹Hospital de Bellvitge, Spain, ¹⁰Hospital Puerta del Hierro, Spain, ¹¹Hospital Povisa de Vigo, Spain, ¹²Hospital General Yagüe, Spain, ¹³H. Germans Trias I Pujol, Spain

S.V. Hosseini¹, P. Jafari², S.A. Taghavi³, A. Rezaianzadeh⁴, M. Moini³, M. Mehrabi³, A.R. Safarpour*³

¹Shiraz University of Medical Sciences, Colorectal Research Center, Shiraz, Iran, Islamic Republic of, ²Shiraz University of Medical Sciences, Biostatistics ward, Shiraz, Iran, Islamic Republic of, ³Shiraz University of Medical Sciences, Gastroenterohepatology Research Center, Shiraz, Iran, Islamic Republic of, ⁴Shiraz University of Medical Sciences, Nutrition and Health School, Shiraz, Iran, Islamic Republic of

G. Dumitrescu, C. Mihai, M. Dranga, O. Nedelciuc, C. Cijevschi Prelipcean, University of Medicine and Pharmacy “Gr. T. Popa”, Iasi, Institute of Gastroenterology and Hepatology, Iasi, Romania

N. Azzopardi¹, P. Ellul¹, ¹Mater dei Hospital, Gastroenterology, Msida, Malta

O. Sezgin*¹, B. Boztepe², E. Altintas³, E.A. Kanik⁴, D. Ovla⁴

¹Mersin , Gastroenterology, Mersin, Turkey, ²Keşan State Hospital, Internal Medicine, Edirne, Turkey, ³Mersin, Gastroenterology, Mersin, Turkey, ⁴Mersin, Biostatistics and Bioinformatics, Mersin, Turkey

M.H. Mosli^1,2, B.G. Feagan^2,3, G. Zou^2,3, K. Geboes⁴, C. Langner⁵, M. Peterson⁶, R. Pai⁷, W.J. Sandborn^2,8, G. D'Haens^2,9, M.K. Vandervoort², C. Behling¹⁰, K. Kaplan¹¹, L.M. Shackelton², J. Jones², R. Khanna², B.G. Levesque^2,8, ¹King Abdulaziz University, Department of Medicine, Jeddah, Saudi Arabia, ²Robarts Clinical Trials Inc., Robarts Research Institute, Western University, London, Ontario, Canada, ³Western University, Department of Epidemiology and Biostatistics, London Ontario, Canada, ⁴University Hospital of KU Leuven, Department of Pathology, Leuven, Belgium, ⁵Medical University of Graz, Institute of Pathology, Graz, Austria, ⁶Western Washington Pathology and Multicare Health System, Pathology, Tacoma, United States, ⁷Cleveland Clinic, Department of Anatomic Pathology, Cleveland Ohio, United States, ⁸University of California, San Diego, Division of Gastroenterology, La Jolla, United States, ⁹University of Amsterdam, Academic Medical Center, Amsterdam, Netherlands, ¹⁰Pacific Rim Pathology Medical Corporation, Pathology, San Diego California, United States, ¹¹Carolinas Medical Center, Medicine, Charlotte North Carolina, United States

G. Hundorfean¹, M.T. Chiriac¹, M.F. Neurath¹, J. Mudter¹, ¹University of Erlangen-Nuremberg, Medical Clinic 1 Erlangen, Erlangen, Germany

D. Trabulo*¹, J. Moleiro², I. Rosa², C. Fidalgo³, J. Pereira da Silva², P. Fidalgo⁴, R. Fonseca⁵, P. Chaves⁵, A. Dias Pereira²

¹Centro Hospitalar de Setúbal - Hospital de São Bernardo, Gastroenterology, Setúbal, Portugal, ²Instituto Português de Oncologia de Lisboa Francisco Gentil, EPE, Gastroenterology, Lisboa, Portugal, ³Hospital Beatriz Ângelo, Gastroenterology, Loures, Portugal, ⁴Fundacao Champallimaud, Gastroenterology, Lisboa, Portugal, ⁵Instituto Português de Oncologia de Lisboa Francisco Gentil, EPE, Pathology, Lisboa, Portugal

K.B. Gecse¹, M. Löwenberg¹, P. Bossuyt², P. Rutgeerts³, S. Vermeire⁴, L. Stitt⁵, M.K. Vandervoort⁵, W.J. Sandborn^5,6, B.G. Feagan^5,7, M.A. Samaan^1,5, R. Khanna⁵, E. Dubcenco⁵, B.G. Levesque^5,6, G. D'Haens^1,5, ¹University of Amsterdam, Academic Medical Center, Amsterdam, Netherlands, ²Imelda Hospital, Imelda GI Clinical Research Center, Bonheiden, Belgium, ³University Hospitals Gasthuisberg, Department of Gastroenterology, Leuven, Belgium, ⁴University Hospital, Department of Gastroenterology, Leuven, Belgium, ⁵Robarts Clinical Trials Inc., Robarts Research Institute, Western University, London, Ontario, Canada, ⁶University of California, San Diego, Division of Gastroenterology, La Jolla, United States, ⁷Western University, Department of Epidemiology and Biostatistics, Department of Medicine, London Ontario, Canada

L. de Ridder¹, D. Turner², S. Koletzko³, J. Martín de Carpi⁴, U.L. Fagerberg⁵, C. Spray⁶, M. Sladek⁷, D.C. Wilson⁸, E. Roma-Giannikou⁹, J. Bronsky¹⁰, D.E. Serban¹¹, S. Cucchiara¹², G. Veres¹³, F.M. Ruemmele¹⁴, I. Hojsak¹⁵, K.L. Kolho¹⁶, A. Levine¹⁷, ¹Erasmus MC/Sophia Children's Hospital, Peadiatric Gastroenterology, Rotterdam, Netherlands, ²Shaare Zedek Medical Center, Jerusalem, Israel, ³University of Munich Medical Centre, Germany, ⁴Unidad para el Cuidado Integral de la Enfermedad Inflamatoria Intestinal Pediátrica, Sección de Gastroenterología, Hepatología y Nutrición Pediatrica, Hospital Sant Joan de Déu, Spain, ⁵Centre for Clinical Research, Västmanland County Hospital, Västerås, Karolinska Institutet, Sweden, ⁶Bristol Royal Hospital for Children, United Kingdom, ⁷Department of Pediatrics, Gastroenterology and Nutrition, Polish-American Children's Hospital, Jagiellonnian University Medical College, Poland, ⁸Child Life and Health, University of Edinburgh, United Kingdom, ⁹1st Department of Paediatric of Athens University, Greece, ¹⁰2nd Faculty of Medicine, Charles University and University Hospital Motol, Czech Republic, ¹¹University of Medicine and Pharmacy Iuliu Hatieganu, Cluj-Napoca, Romania, ¹²Pediatric Gastroenterology and Liver Unit, “La Sapienza” University, Italy, ¹³Semmelweis University, Hungary, ¹⁴Université Paris Descartes, Sorbonne Paris Cité, APHP, Hôpital Necker Enfants Malades, France, ¹⁵Referral Center for Pediatric Gastroenterology, Children's Hospital Zagreb, School of Medicine, University of Zagreb, Croatia, ¹⁶Children's Hospital, Helsinki, University Central Hospital and University of Helsinki, Finland, ¹⁷Wolfson Medical Center, Israel

J.H. Bae*, S.H. Park, H.-S. Lee, H.J. Lee, J.S. Soh, S. Lee, M.S. Kwak, D.-H. Yang, K.-J. Kim, J.-S. Byeon, S.-J. Myung, S.-K. Yang, J.-H. Kim, B.D. Ye

University of Ulsan Collage of Medicine, Asan Medical Center, Gastroenterology, Seoul, Korea, Republic of

S.W. Hwang¹, J. Chun¹, J.H. Lim¹, J.P. Im¹, J.H. Cheon², B.D. Ye³, J.W. Kim⁴, Y.S. Kim⁵, J.S. Kim¹, ¹Seoul National University College of Medicine, Department of Internal Medicine and Liver Research Institute, Seoul, Korea, Republic of, ²Yonsei University College of Medicine, Internal Medicine, Seoul, Korea, Republic of, ³Ulsan University College of Medicine, Internal Medicine, Seoul, Korea, Republic of, ⁴Seoul National University Boramae Hospital, Seoul National University College of Medicine, Internal Medicine, Seoul, Korea, Republic of, ⁵Inje University College of Medicine, Internal Medicine, Seoul, Korea, Republic of