¹Gastroenterology, Queen Elizabeth University Hospital, Glasgow, UK, ²Biochemistry, Queen Elizabeth University Hospital, Glasgow, UK

¹Gastroenterology, McMaster University Medical Centre and Farncombe Family Digestive Health Diseases Research Institute, Hamilton, Canada, ²Gastroenterology, Najran University, Najran, Saudi Arabia

¹Department of Gastroenterology, Guy’s and St Thomas’ NHS Foundation Trust, London, UK, ²Department of Pharmacy, Guy’s and St Thomas’ NHS Foundation Trust, London, UK, ³Guy’s and St Thomas’ NHS Foundation Trust, Viapath, London, UK

¹Department of Gastroenterology, Luigi Sacco University Hospital, Milan, Italy, ²Gastroenterology and Digestive Endoscopy Unit, IRCCS Policlinico San Donato, San Donato Milanese - Milano, Italy, ³First Department of Medicine, Istituto di Ricovero e Cura a Carattere Scientifico San Matteo Hospital Foundation - University of Pavia, Istituto di Ricovero e Cura a Carattere Scientifico San Matteo Hospital Foundation - University of Pavia, Pavia, Italy, ⁴Department of Gastroenterology, ASST Rhodense - Rho and Garbagnate Milanese Hospital, Milano, Italy, ⁵Department of Gastroenterology, ‘Maggiore Della Carità’ Hospital - Novara, Novara, Italy, ⁶Gastroenterology Division, San Gerardo Hospital- ASST Monza, Monza, Italy, ⁷ASST Sette Laghi- Ospedale di Circolo Fondazione Macchi, Division of Gastroenterology, Varese, Italy, ⁸Spedali Civili and University of Brescia, Gastroenterology Section - 1st Medical Clinic, Brescia, Italy, ⁹Gastroenterology, ASST Bergamo EST-Ospedale Bolognini, Bergamo, Italy, ¹⁰Gastroenterology Unit, IRCCS San Raffaele Scientific Institute, Milano, Italy, ¹¹Department of Gastroenterology and Endoscopy, IRCCS Ca’ Granda Foundation - University of Milan, Milano, Italy, ¹²Fondazione IRCCS Policlinico San Matteo, Servizio di Epidemiologia Clinica e Biometria Direzione Scientifica, Pavia, Italy

¹Department of Colorectal Surgery, St. Mark’s Hospital, Harrow, UK, ²Faculty of Health and Education, University of Greenwich, London, UK, ³King’s College London, Florence Nightingale Faculty of Nursing, London, UK, ⁴Patient and Public Involvement Team, Patient and Public Involvement Team, London, UK

¹Department of Gastroenterology and Nutrition, Hospital Infantil Universitario Niño Jesús, Madrid, Spain, ²Department of Pediatrics, Hospital Infantil Universitario Niño Jesús, Madrid, Spain

¹Clínica Las Condes, Gastroenterology Department - Inflammatory Bowel Disease, Santiago, Chile, ²Gastroenterology Department - IBD Fellow Clínica Las Condes, San Juan de Dios Hospital, Santiago, Chile

Division of Gastroenterology, Massachusetts General Hospital, Boston, USA

¹Gastroenterology, Alfred Hospital- Alfred Health, Melbourne, Australia, ²Faculty of Medicine Nursing and Health Sciences, Monash University, Melbourne, Australia

¹Surgery Department- Gastroenterology Division, Hospital Beatriz Ângelo, Loures, Portugal, ²Gastroenterology Department, Hospital Amato Lusitano, Castelo Branco, Portugal, ³Gastroenterology Department, Hospital da Senhora da Oliveira, Guimarães, Portugal

¹Beaujon Hospital, Colorectal Surgery, Clichy, France, ²Gastroenterology, Beaujon Hospital, Clichy, France, ³Department of Colorectal Surgery, APHP Beaujon, Clichy, France

¹Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Republic of Korea, ²Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea, ³Department of Internal medicine, Seoul National University College of Medicine, Seoul, Republic of Korea, ⁴Department of Gastroenterology, Kyung Hee University Hospital, Seoul, Republic of Korea, ⁵Department of Gastroenterology, The Catholic University of Korea St. Vincent’s Hospital, Suwon, Republic of Korea, ⁶Department of Gastroenterology, SMG-SNU Boramae Medical Center, Seoul, Republic of Korea, ⁷Department of Gastroenterology, Ewha Womans University Hospital, Seoul, Republic of Korea, ⁸Department of Internal Medicine, Chosun University College of Medicine, Gwagju, Republic of Korea, ⁹Department of Gastroenterology, The Catholic University of Korea Daejeon ST. Mary’s Hospital, Daejeon, Republic of Korea, ¹⁰Department of Gastroenterology, Ajou University School of Medicine, Suwon, Republic of Korea, ¹¹Department of Gastroenterology, Korea University Anam Hospital, Seoul, Republic of Korea, ¹²Department of Gastroenterology, Inje University Seoul Paik Hospital, Seoul, Republic of Korea, ¹³Department of Gastroenterology, Inje University Haeundae Paik Hospital, Busan, Republic of Korea, ¹⁴Department of Gastroenterology, Chonnam National University Hospital, Gwagju, Republic of Korea, ¹⁵Department of Internal Medicine, Sungkyunkwan University School of Medicine- Kangbuk Samsung Hospital, Seoul, Republic of Korea, ¹⁶Department of Gastroenterology, Inha University Hospital, Incheon, Republic of Korea, ¹⁷Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu, Republic of Korea, ¹⁸Department of Medicine, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea, ¹⁹Abbvie Ltd., Abbvie Ltd., Seoul, Republic of Korea, ²⁰AbbVie Pte. Ltd., AbbVie Pte. Ltd., Singapore, Singapore

Institute of Gastroenterology, Tokyo Women’s Medical University, Tokyo, Japan

Department of Surgery, Shanghai Ninth People’s Hospital -Shanghai Jiaotong University School, Shanghai, China

¹Department of Gastroenterology and Hepatology, University Hospital Medical Center ‘ Zvezdara’, Belgrade, Serbia, ²Department of Pathology, University Hospital Medical Center ‘ Zvezdara’, Belgrade, Serbia, ³Department of Nephrology, University Hospital Medical Center ‘ Zvezdara’, Belgrade, Serbia

Medical University – Varna- Bulgaria, University Hospital St. Marina- Clinic of Gastroenterology, Varna, Bulgaria

¹University of Helsinki and Helsinki University Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland, ²Tampere University Hospital, Tampere University Hospital, Tampere, Finland, ³ESiOR Oy, ESiOR Oy, Kuopio, Finland, ⁴Kanta-Häme Central Hospital, Kanta-Häme Central Hospital, Hämeenlinna, Finland, ⁵North Karelia Central Hospital, North Karelia Central Hospital, Joensuu, Finland, ⁶South Karelia Central Hospital, South Karelia Central Hospital, Lappeenranta, Finland, ⁷Lapland Central Hospital, Lapland Central Hospital, Rovaniemi, Finland, ⁸Oulu University Hospital, Oulu University Hospital, Oulu, Finland, ⁹Central Finland Central Hospital, Central Finland Central Hospital, Jyväskylä, Finland, ¹⁰Satakunta Central Hospital, Satakunta Central Hospital, Pori, Finland, ¹¹Vaasa Central Hospital, Vaasa Central Hospital, Vaasa, Finland, ¹²Turku University Hospital, Turku University Hospital, Turku, Finland, ¹³Kuopio University Hospital, Kuopio University Hospital, Kuopio, Finland, ¹⁴Kainuu Central Hospital, Kainuu Central Hospital, Kajaani, Finland, ¹⁵Päijät-Häme Central Hospital, Päijät-Häme Central Hospital, Lahti, Finland, ¹⁶Turku University Hospital- Salo Hospital, Turku University Hospital- Salo Hospital, Salo, Finland, ¹⁷Central Ostrobothnia Central Hospital, Central Ostrobothnia Central Hospital, Kokkola, Finland, ¹⁸Janssen Cilag AB, Medical Affairs, Solna, Sweden, ¹⁹Statens Serum Institut, Department of Epidemiology Research, Copenhagen, Denmark, ²⁰Janssen Cilag Limited, emea hemar, High Wycombe, UK, ²¹Janssen Cilag Oy, Medical Affairs, Espoo, Finland

¹Nutrition and Dietetic Department, Sotiria General Hospital, Athens, Greece, ²Department of Nutrition and Dietetics, Harokopio University, Athens, Greece, ³GI Unit- 3rd Department of Internal Medicine, Sotiria General Hospital, Athens, Greece, ⁴2nd Department of Surgery, Aretaieion Hospital, Athens, Greece

¹Hospital Universitario Ramón y Cajal, Servicio de Gastroenterologia y Hepatología, Madrid, Spain, ²Hospital Universitari de Bellvitge, Servicio de Aparato Digestivo, Barcelona, Spain, ³Hospital General Universitario de Alicante, Servicio Medicina Digestiva, alicante, Spain, ⁴Hospital Universitari Germans Trias i Pujol, Servicio de Aparato Digestivo, Badalona, Spain, ⁵Hospital Universitario de Fuenlabrada, Servicio de Aparato Digestivo, madrid, Spain, ⁶Hospital Universitario de Torrejón., Servicio de Aparato Digestivo, Madrid, Spain

¹New York University Medical Center, Medicine, New York, USA, ²Cleveland Clinic Medical Center, Medicine, Cleveland, USA, ³Karolinska, Clinical Epidemiology, Solna, Sweden, ⁴Gastroenterology and Hepatology, New York University Medical Center, New York, USA, ⁵Gastroenterology- Hepatology- and Nutrition, Cleveland Clinic Medical Center, Cleveland, USA