¹Medical faculty Mannheim, Heidelberg University, Department of Medicine II, Mannheim, Germany, ²Medical faculty Mannheim, Heidelberg University, Department of Neurology, Mannheim, Germany, ³Odenwald District Healthcare Center, Center for Mental Health, Erbach, Germany

¹Semmelweis University, First Department of Internal Medicine, Budapest, Hungary, ²McGill University Health Center, Division of Gastroenterology, Montreal, Canada

¹Royal Devon and Exeter Hospital, Gastroenterology, Exeter, UK

¹Sapporo Kosei General Hospital, Department of Pediatrics, Sapporo, Japan, ²Sapporo Kosei General Hospital, IBD Center, Sapporo, Japan, ³National Center for Child Health and Development, Division of Gastroenterology, Setagaya, Japan, ⁴Miyagi Children's Hospital, Department of General Pediatrics, Sendai, Japan, ⁵Hakodate Goryoukaku Hospital, Department of Gastroenterology, Hakodate, Japan, ⁶Tokyo Yamate Medical Center, Department of Internal Medicine, Division of IBD, Shinjuku, Japan, ⁷Nagoya City University, Graduate School of Medical Sciences, Department of Gastroenterology and Metabolism, Nagoya, Japan, ⁸JIMRO Co., Ltd., MA, Takasaki, Japan

¹Odense University Hospital, Department of Medical Gastroenterology, Odense, Denmark, ²Nordic Bioscience, Biomarkers and Research, Herlev, Denmark

¹Inflammatory Bowel Disease Center, University of Chicago Medicine, Chicago, USA

¹The Children’s Memorial Health Institute, Department of Gastroenterology, Hepatology, Feeding Disorders and Paediatrics, Warsaw, Poland

¹Icahn School of Medicine at Mount Sinai, Department of Pathology, New York, USA, ²Icahn School of Medicine at Mount Sinai, Department of Medicine, Gastroenterology, New York, USA

¹National Medical Research Center for Children's Health, Gastroenterology and Hepatology, Moscow, Russian Federation, ²National Medical Research Center for Children's Health, Laboratory of Experimental Immunology and Virology, Moscow, Russian Federation, ³Sechenov First Moscow State Medical University, Department of Peliatrics and Rheumatology, Moscow, Russian Federation, ⁴National Medical Research Center for Children's Health, Cytochemical Research Center, Moscow, Russian Federation

¹Erasmus MC, Department of Gastroenterology and Hepatology, Rotterdam, The Netherlands, ²Erasmus MC, Department of Biostatistics, Rotterdam, The Netherlands

¹University of Medical Sciences, General, Endocrinological Surgery and Gastrointestinal Oncology, Poznań, Poland, ²University of Medical Sciences, Department of Gastroenterology, Poznan, Poland

¹Yokkaichi Hazu Medical Centre, IBD Centre, Yokkaichi, Japan

¹São Paulo University Medical School, Pediatric, São Paulo, Brazil, ²Hospital Israelita Albert Einstein, GI, São Paulo, Brazil, ³Hospital Israelita Albert Einstein, Surgery, São Paulo, Brazil, ⁴UNIFESP-EPM, GI, SP, Brazil, ⁵Hospital Israelita Albert Einstein, Research, São Paulo, Brazil, ⁶Hospital Israelita Albert Einstein, Oncology-hematology, São Paulo, Brazil

¹Guy's and St.Thomas' NHS Foundation Trust, Nutrition and Dietetics, London, UK, ²King's College London, Nutritional Sciences Division, London, UK, ³Guy's and St. Thomas' NHS Foundation Trust, Colorectal Surgery, London, UK, ⁴Guy's and St. Thomas' NHS Foundation Trust, Gastroenterology, London, UK

¹Multispecialistic Centre for Recto-Perineal Diseases (IBD Unit), Department of Gastroenterology, IRCCS Ospedale Sacro Cuore Don Calabria, Negrar (Verona), Italy

¹Hospital Sykehuset Østfold, Department of Gastroenterology, Sarspborg, Norway, ²Østfold University College, Halden, Norway, ³Hospital Sykehuset Østfold, Department of Research, Sarspborg, Norway

¹Moscow Clinical Scientific Center named after A. S. Loginov, Department of inflammatory bowel diseases, Moscow, Russian Federation, ²Moscow Clinical Scientific Center named after A. S. Loginov, Infection department, Moscow, Russian Federation

¹Clinical Center Zvezdara, Department of Gastroenterology, Belgrade, Serbia, ²Institute of Public Health of Belgrade, Health Promotion, Belgrade, Serbia

¹University of Szeged, First Department of Medicine, Szeged, Hungary, ²University of Szeged, Institute of Laboratory Medicine, Szeged, Hungary

¹GI Unit, 3rd Academic Department of Internal Medicine, Athens, Greece, ²General Hospital ‘Laikon’, Neurological Unit,, Athens, Greece, ³Sotiria Hospital, National and Kapodistrian University of Athens, GI-Unit, 3rd Academic Department of Internal Medicine, Athens, Greece