¹Department of Diagnostic Imaging, Sheba Medical Center, Tel Hashomer, Israel, ²Department of Inflammatory Bowel Disease, St Mark’s Hospital, London, UK

Whittington Hospital, Gastroenterology, London, UK

¹University of Manitoba, Department of Paediatric Gastroenterology, Winnipeg, Canada, ²University of Manitoba, Department of Pediatrics, Winnipeg, Canada

¹Massachusetts General Hospital, Division of Gastroenterology, Boston, USA, ²University of North Carolina, Gastroenterology, Chapel Hill, USA, ³Erasmus University Medical Center, Gastroenterology & Hepatology, Rotterdam, The Netherlands

The University of Tokyo, Department of Surgery- The Institute of Medical Science- Department of Medical Science Hospital, Tokyo, Japan

Seoul National University College of Medicine, Department of Internal Medicine and Liver Research Institute, Seoul, Republic of Korea

Marqués de Valdecilla University Hospital, Gastroenterology, Santander- Cantabria, Spain

¹Asan Medical Centre, Department of Internal Medicine, Seoul, Republic of Korea, ²Asan Medical Centre, Department of Infectious Diseases, Seoul, Republic of Korea, ³Asan Medical Centre, Department of Gastroenterology- Inflammatory Bowel Disease Centre, Seoul, Republic of Korea, ⁴Asan Medical Centre, Department of Gastroenterology, Seoul, Republic of Korea

Mustafa Kemal University School of Medicine, Department of Gastroenterology, Antakya/HATAY, Turkey

¹San Filippo Neri, IBD Unit- Gastroenterology, Rome, Italy, ²Università Cattolica del Sacro Cuore, EngageMinds Hub Research, Department of Psychology, Milan, Italy, ³San Filippo Neri Hospital, IBD Unit, Gastroenterology, Rome, Italy

¹Sheba Medical Center, Tel Hashomer, Department of Gastroenterology, Ramat Gan, Israel, ²Tel-Aviv University, Sackler school of Medicine, Tel Aviv, Israel, ³Sheba Medical Center, Tel Hashomer, Department of Diagnostic Imaging, Ramat Gan, Israel, ⁴Sheba Medical Center, Tel Hashomer, DeepVision Lab, Ramat Gan, Israel, ⁵Sheba Medical Center, Tel Hashomer, Pulmonary Institute, Ramat Gan, Israel

¹Hamad Medical Corporation, Department of Gastroenterology, Doha, Qatar, ²Hamad Medical Corporation, Research Affairs, Doha, Qatar, ³Hamad Medical Corporation, Department of Radiology, Doha, Qatar

¹Brotzu Hospital, Gastroenterology Unit, Cagliari, Italy, ²San Martino Hospital, Digestive Endoscopy, Oristano, Italy, ³’P. Colombo’ Hospital, General Surgery, Velletri, Italy, ⁴San Camillo Forlanini Hospital, Gastroenterology Unit, Rome, Italy, ⁵Santissima Trinita Hospital, Gastroenterology Unit, Cagliari, Italy, ⁶Policlinico Universitario, Gastroenterology Unit, Cagliari, Italy, ⁷Università, Clinica Medica, Sassari, Italy, ⁸Santissima Annunziata Hospital, Gastroenterology Unit, Sassari, Italy, ⁹Cardinale Panico Hospital, Medicine, Tricase, Italy, ¹⁰NS Bonaria Hospital, Endoscopy, San Gavino, Italy, ¹¹Presidio Columbus Fondazione Policlinico Universitario A. Gemelli IRCCS- Università Cattolica del Sacro Cuore, IBD Unit, Rome, Italy

¹Tel-Aviv Medical Center, IBD Center, Department of Gastroenterology and Liver Diseases, Tel-Aviv, Israel, ²Tel-Aviv University, The Sackler Faculty of Medicine, Tel-Aviv, Israel, ³University of Haifa, School of Public Health, Haifa, Israel

¹Kliniczny Szpital Wojewodzki Nr 2 im. Sw. Krolowej Jadwigi w Rzeszowie, Klinika Gastroenterologii i Centralna Pracownia Endoskopii, Rzeszow, Poland, ²Uniwersytet Rzeszowski, Instytut Nauk o Zdrowiu- Kolegium Nauk Medycznych, Rzeszów, Poland

¹Medical University of Lublin, Department of Conservative Dentistry with Endodontics, Lublin, Poland, ²Medical College of Rzeszow University, Institute of Health Sciences, Rzeszow, Poland, ³Medical University of Lublin, Department of Pharmaceutical Microbiology, Lublin, Poland, ⁴Clinical Hospital No.2 Rzeszow- affiliated to University of Rzeszow, Department of Internal Medicine- Endocrinology and Nephrology, Rzeszow, Poland, ⁵Medical College of Rzeszow University, Department of Gastroenterology with IBD Unit of Clinical Hospital No.2- Poland, Rzeszow, Poland

¹Kyungpook National University Children’s Hospital- Kyungpook National University School of Medicine, Department of Pediatrics, Daegu, Republic of Korea, ²Samsung Medical Center- Sungkyunkwan University School of Medicine, Department of Pediatrics, Seoul, Republic of Korea, ³Severance Hospital- Yonsei University College of Medicine, Department of Pediatrics, Seoul, Republic of Korea, ⁴Pusan National University Children’s Hospital- Pusan National University School of Medicine, Department of Pediatrics, Yangsan, Republic of Korea, ⁵Gachon University Gil Medical Center- Gachon University College of Medicine, Department of Pediatrics, Incheon, Republic of Korea

¹Digestive Unit Hospital de Barbastro, Barbastro, Spain, ²Digestive Unit Hospital Royo Villanova, Zaragoza, Spain, ³Digestive Unit Hospital San Jorge, Huesca, Spain, ⁴Digestive Unit Hospital Obispo Polanco, Teruel, Spain, ⁵Digestive Unit Hospital de Alcañiz, Barbastro, Spain, ⁶Digestive Unit Hospital Ernest LLuch, Calatayud, Spain, ⁷Digestive Unit Hospital Clínico Universitario, Zaragoza, Spain, ⁸Hospital Miguel Servet, Zaragoza, Spain, ⁹carretera nacional 240, Digestive unit, Barbastro, Spain

¹University Hospital of Larisa, Gastroenterology, Larisa, Greece, ²General Hospital of Athens ‘Sismanogleio’, Gastroenterology, Athens, Greece, ³University Hospital of Athens ‘Laiko’, Public Health, Athens, Greece

¹University Medical Center - Groningen, Department of Gastroenterology and Hepatology, Groningen, The Netherlands, ²University Medical Center Groningen, Department of Epidemiology, Groningen, The Netherlands, ³Wageningen University and Research, Division of Human Nutrition and Health, Wageningen, The Netherlands