¹Division of Gastroenterology, Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto HCFMRP, Medicine, Ribeirão Preto, Brazil, ²Division of Coloproctology, Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto HCFMRP, Surgery and Anatomy, Surgery and Anatomy, Brazil

¹Department of Nutrition and Dietetics, Gangnam Severance Hospital, Seoul, Korea Republic of, ²Department of Internal Medicine, Gangnam Severance Hospital, Seoul, Korea Republic of, ³Department of Internal Medicine, Severance Hospital, Seoul, Korea Republic of

North-Western State Medical University n.a. I.I.Mechnikov, the Chair of the Propedeutics of Internal Diseases, Gastroenterology and Dietology n.a. S.M. Riss, Saint Petersburg, Russian Federation

¹Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea Republic of, ²Department of Medical Statistics, The Catholic University of Korea College of Medicine, Seoul, Korea Republic of, ³Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea Republic of

¹Ben-Gurion University of the Negev, Social Work, Beer Sheva, Israel, ²Soroka Medical center, Gastroenterology, Beer Sheva, Israel, ³Ben-Gurion University of the Negev, Public Health, Beer Sheva, Israel, ⁴Ben-Gurion University of the Negev, Microbiology and Immunology, Beer Sheva, Israel, ⁵Ben-Gurion University of the Negev, Health Systems Management, Beer Sheva, Israel, ⁶Ben-Gurion University of the Negev, Health Sciences, Metar, Israel

¹St Mark’s Hospital, Wolfson Endoscopy Unit, London, UK, ²Imperial College London, Cancer and Surgery Division, London, UK, ³Stats Consultancy, Stats Consultancy, Amersham, UK, ⁴St Mark’s Hospital, Inflammatory Bowel Diseases Unit, London, UK, ⁵St Mark’s Hospital, Department colorectal surgery, London, UK

¹Departement of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium, ²Department of Gastroenterology, Imelda General Hospital Bonheiden,Bonheiden, Belgium, ³Departement of Pathology, University Hospitals Leuven, Leuven, Belgium, ⁴Medical Imaging Research Center, University Hospitals Leuven, Leuven, Belgium

¹Centro Hospitalar Vila Nova de Gaia e Espinho, Gastroenterology, Vila Nova Gaia, Portugal, ²Centro Hospitalar Vila Nova de Gaia/Espinho, Gastroenterology, Vila Nova de Gaia, Portugal, ³Centro Hospitalar de Vila Nova de Gaia e Espinho, Gastroenterology, Vila Nova de Gaia, Portugal

¹Centre for Colorectal Disease, St Vincent’s University Hospital and School of Medicine- University College Dublin, Dublin, Ireland, ²UCD Obstetrics and Gynaecology Department, School of Medicine, University College Dublin, National Maternity Hospital, Dublin, Ireland

¹Nuffield Department of Medicine, University of Oxford, Translational Gastroenterology Unit, Oxford, UK, ²Clatterbridge Cancer Centre, Oncology, Liverpool, UK, ³Royal Liverpool University Hospital, Gastroenterology, Liverpool, UK, ⁴John Radcliffe Hospital, Cellular Pathology, Oxford, UK, ⁵Institute of Translational Medicine, University of Liverpool, Molecular and Clinical Pharmacology, Liverpool, UK, ⁶Oxford Cancer Centre, Medical Oncology, Oxford, UK

¹Humanitas Research Hospital, IBD Center- Gastroenterology, Rozzano, Italy, ²Inserm U954 Nancy University Hospital, IBD Unit, Nancy, France

¹Asan Medical Center, Gastroenterology, Seoul, Korea Republic of, ²Asan Medical Center, Clinical Epidemiology and Biostatistics, Seoul, Korea Republic of

¹Department of General Surgery, New Cross Hospital, Wolverhampton, UK, ²Department of General Surgery, Academic Foundation Trainee, Wolverhampton, UK

Department of Gastroenterology and Hepatology, Graduate School of Medicine, Kyoto University, Kyoto, Japan

University of Rome Tor Vergata, Gastroenterology, Rome, Italy

The Jikei University School of Medicine, Gastroenterology and Hepatology, Tokyo, Japan

¹St Mark’s Hospital and Academic Institute, Department of Radiology, London, UK, ²St Mark’s Hospital and Academic Institute, Fistula Research Unit, London, UK, ³St Mark’s Hospital and Academic Institute, Colorectal surgery, London, UK, ⁴St Mark’s Hospital and Academic Institute, Department of Gastroenterology, London, UK

Theagenion CHT, Gastroenterology, Thessaloniki, Greece

University of California San Diego, Department of Gastroenterology, San Diego, USA

¹Rabin Medical Center, Division of Gastroenterology, Petah Tikva, Israel, ²Asian Institute of Gastroenterology, Gastroenterology, Hyderabad, India