¹College of Medicine, Korea University, Preventive Medicine, Seoul, South Korea, ²Gangnam Severance Hospital, Yonsei University College of Medicine, Internal Medicine, Seoul, South Korea

¹University of Colorado School of Medicine, Division of Gastroenterology and Hepatology, Aurora, USA, ²University of North Carolina at Chapel Hill, Division of Gastroenterology and Hepatology, Chapel Hill, USA, ³University of Colorado School of Medicine, Department of Medicine, Aurora, USA, ⁴University of Pennsylvania, Center for Clinical Epidemiology and Biostatistics, Philadelphia, USA

¹Oslo university hospital, Gastroenterology, Oslo, Norway, ²University of Oslo, Institute of Clinical Medicine, Oslo, Norway, ³Oslo university hospital, Department of Rheumatology, Oslo, Norway, ⁴Oslo and Akershus University College, Faculty of Health Sciences, Oslo, Norway, ⁵Diakonhjemmet Hospital, Gastroenterology, Oslo, Norway

¹Hadassah-Hebrew University Medical Center, Institute of Gastroenterology and Liver Diseases, Jerusalem, Israel, ²Sheba Medical Center, Department of Gastroenterology, Ramat Gan, Israel, ³Tel-Aviv University, Sackler School of Medicine, Tel Aviv, Israel, ⁴Hebrew University Hadassah Medical School, Jerusalem, Israel, ⁵Schneider Children's Hospital, Institute of Gastroenterology, Nutrition and Liver Diseases, Petach Tikva, Israel

University of Exeter, IBD Pharmacogenetics, Exeter, UK

¹Corporal Michael J. Crescenz, VA Medical Center, Gastroenterology, Philadelphia, USA, ²University of Pennsylvania, Perelman School of Medicine, Gastroenterology, Philadelphia, USA

¹Royal Liverpool and Broadgreen University Hospital Trust, Liverpool, UK, ²The University of Liverpool, Cellular and Molecular Physiology, Liverpool, UK

¹Medical faculty Mannheim, Heidelberg University, Department of medicine II, Mannheim, Germany, ²Central institute of mental health, Medical faculty Mannheim, Heidelberg University, Department of experimental psychology, Mannheim, Germany

¹Azienda Ospedaliera Consorziale Policlinico, Bari, Italy, ²University of Bari, DETO, Bari, Italy, ³Sanitanova SRL, Milan, Italy, ⁴University of Bari, Department of Emergency and Organ Transplantation, Bari, Italy

¹Gastroenterology Department, Hospital Universitario Gregorio Marañón, Madrid, Spain, ²Gastroenterology Department, Hospital Universitario Vall d'Hebron, Barcelona, Spain, ³Merck Sharp and Dohme, Spain, Medical Affairs, Madrid, Spain

¹Corporal Michael J. Crescenz, VA Medical Center, Gastroenterology, Philadelphia, USA, ²University of Pennsylvania, Perelman School of Medicine, Gastroenterology, Philadelphia, USA

¹Ist Dept of Pediatrics, Semmelweis University, Budapest, Hungary, ²Ist Dept of Pediatrics, Semmelweis Universtiy, Budapest, Hungary

¹Seoul National University College of Medicine, Preventive Medicine, Seoul, South Korea, ²Gangnam Severance Hospital, Yonsei University College of Medicine, Internal Medicine, Seoul, South Korea, ³Severance Hospital, Yonsei University College of Medicine, Internal Medicine, Seoul, South Korea

¹Gastroenterology Department, Hospital Universitario Vall d'Hebron, Barcelona, Spain, ²Gastroenterology Department, Hospital Universitario Gregorio Marañón, Madrid, Spain, ³Rheumatology Department, Hospital Universitario A Coruña, Universidade da Coruña, INIBIC, A Coruña, Spain, ⁴Internal Medicine Department, Hospital Clínico de Valencia, Valencia, Spain, ⁵Merck Sharp and Dohme, Spain, Medical Affairs, Madrid, Spain, ⁶Department of Medicine, Miguel Hernández University, Sant Joan, Alicante, Spain

¹Kyungpook National University School of Medicine, Intermal Medicine, Daegu, South Korea, ²Yeungnam University College of Medicine, Internal Medicine, Daegu, South Korea, ³Keimyung University School of Medicine, Internal Medicine, Daegu, South Korea, ⁴Catholic University of Daegu School of Medicine, Internal Medicine, Daegu, South Korea, ⁵Dongguk University School of Medicine, Internal Medicine, Daegu, South Korea

¹Team Gesundheit GmbH, Essen, Germany, ²Takeda Pharma Vertrieb GmbH, Berlin, Germany

¹Rabin Medical Center, Division of Gastroenterology, Petah-Tikva, Israel, ²Tel Aviv University, Sackler Faculty of Medicine, Tel Aviv, Israel, ³Tel Aviv Sourasky Medical Center, Proctology Unit, Department of Surgery, Tel Aviv, Israel

¹King's College Hospital NHS Foundation Trust, Paediatric Gastroenterology, Hepatology and Nutrition, London, UK, ²King's College Hospital NHS Foundation Trust, London, UK

University Hospital Ulm, Department of Internal Medicine I, Ulm, Germany

¹Yeungnam University College of Medicine, Division of Gastroenterology and Hepatology, Department of Internal Medicine, Daegu, South Korea, ²Dongguk University Collge of Medicine, Division of Gastroenterology and Hepatology, Department of Internal Medicine, Kyungju, South Korea