¹‘Gr.T Popa’ Medicine and Pharmacy University, Medical Semiology and Gastroenterology, Iasi, Romania, ²Institute of Gastroenterology and Hepatology, Iasi, Romania

¹Mauriziano Hospital, Surgery, Turin, Italy, ²Mauriziano Hospital, Gastroenterology Unit, Torino, Italy

¹Soroka Medical Center, Gastroenterology, Beer Sheva, Israel, ²Ben-Gurion University of the Negev, Social Work, Beer Sheva, Israel, ³Ben-Gurion University of the Negev, Public Health, Beer Sheva, Israel, ⁴Ben-Gurion University of the Negev, Microbiology, Immunology and Genetics, Beer Sheva, Israel, ⁶Ben-Gurion University of the Negev, Health Systems Management, Beer Sheva, Israel, ⁷Shaare Zedek Medical Center, Gastroenterology, Jerusalem, Israel, ⁸Sheba Medical Center, Gastroenterology, Tel Hashomer, Israel, ⁹Rambam Health Care Campus, Gastroenterology, Haifa, Israel, ¹⁰Rabin Medical Center, Gastroenterology, Petach Tikva, Israel

¹Hospital Universitari de Bellvitge, Gastroenterology, L’Hospitalet de Llobregat, Spain, ²Universitat de Barcelona, Barcelona, Spain, ³Hospital Universitari de Bellvitge, Pharmacy, L’Hospitalet de Llobregat, Spain, ⁴Hospital Universitari de Bellvitge, Immunology, L’Hospitalet de Llobregat, Spain

¹IRCCS Sacro Cuore Don Calabria, IBD Unit, Negrar, Italy, ²IRCCS Sacro Cuore Don Calabria, Division of Medical Oncology, Negrar, Italy, ³IRCCS Sacro Cuore Don Calabria, Department of Pathology, Negrar, Italy, ⁴Mount Sinai Hospital University of Toronto, Department of Pathology and Laboratory Medicine, Toronto, Canada

¹University of Gdansk, Institute of Psychology, Gdansk, Poland, ²Independent Public Health Care of the Ministry of the Internal Affairs, Department of Gastroenterology, Gdansk, Poland, ³Kazimierz Wielki University, Department of Clinical Psychology, Bydgoszcz, Poland, ⁴Central Clinical Hospital of the Ministry of Interior and Administration, Department of Gastroenterology, Warsaw, Poland, ⁵Jan Kochanowski University, The Faculty of Medicine and Health Sciences, Kielce, Poland, ⁶Iran University of Medical Sciences, School of Behavioral Sciences and Mental Health (Tehran Institute of Psychiatry), Tehran, Iran, Islamic Republic of, ⁷University of Social Welfare and Rehabilitation Sciences, Iranian Research Centre on Aging, Tehran, Iran, Islamic Republic of

¹Odense University Hospital, Center for Clinical Epidemiology, Odense, Denmark, ²University of Southern Denmark, Department of Clinical Research, Research unit of Clinical Epidemiology, Odense, Denmark, ³Hospital of Southwest Jutland, Department of Medicine, Esbjerg, Denmark, ⁴University of Southern Denmark, Institute for Regional Health Science, Center Southwest Jutland, Esbjerg, Denmark, ⁵Odense University Hospital, Department of Medical Gastroenterology S, Odense, Denmark, ⁶University of Southern Denmark, Department of Clinical Research, Research unit of Medical Gastroenterology, Odense, Denmark, ⁷Odense University Hospital, Hans Christian Andersen Children's Hospital, Odense, Denmark, ⁸University of Southern Denmark, Department of Clinical Research, Research unit of Pediatrics, Odense, Denmark

¹Örebro University, Department of Gastroenterology, Faculty of Medicine and Health, Örebro, Sweden, ²Skåne University Hospital, Department of Gastroenterology, Malmö, Sweden, ³Central Hospital, Department of Internal Medicine, Karlstad, Sweden, ⁴Linköping University, Department of Clinical and Experimental Medicine, Linköping, Sweden, ⁵Linköping University, Department of Gastroenterology, Linköping, Sweden, ⁶Umeå University, Department of Public Health and Clinical Medicine, Umeå, Sweden, ⁷Örebro University, Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro, Sweden, ⁸University College London, Department of Epidemiology and Public Health, London, UK, ⁹Karolinska Institutet, Clinical Epidemiology Unit, Department of Medicine Solna, Stockholm, Sweden, ¹⁰Linköping University Hospital, Department of Surgery, Linköping, Sweden, ¹¹Stockholm South General Hospital, Sachs’ Children and Youth Hospital, Stockholm, Sweden, ¹²Karolinska Institutet, Department of Clinical Science and Education Södersjukhuset, Stockholm, Sweden, ¹³Karolinska Institutet, Department of Medical Epidemiology and Biostatistics, Stockholm, Sweden, ¹⁴Örebro University Hospital, Department of Pediatrics, Örebro, Sweden

¹Dr., Gastroenterology, Padova, Italy, ²University of Padua, Department of Oncological Gastrointestinal Surgery, Padova, Italy, ³University of Padua, Department of Surgery, Oncology and Gastroenterology, Gastroenterology Section, Padova, Italy

¹MassGeneral Hospital for Children, Boston, USA, ²Janssen Scientific Affairs, LLC, Horsham, USA, ³Janssen Research & Development, LLC, Spring House, USA, ⁴Connecticut Children’s Medical Center, Hartford, USA

¹Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, General Surgery, Hangzhou, China, ²Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Department of Gastroenterology, Hangzhou, China

¹Amsterdam UMC, Surgery, Amsterdam, The Netherlands, ²Amsterdam UMC, Gastroenterology, Amsterdam, The Netherlands

¹Hospices Civils de Lyon, Gastroenterology, PIERRE BENITE, France, ³CHU Saint Etienne, Gastroenterology, Saint Etienne, France, ⁴Hospices Civils de Lyon, Biochemistry, Pierre Benite, France, ⁵Hospices Civils de Lyon, Gastroenterology Paediatry, Bron, France, ⁶CHU Saint Etienne, GIMAP, Saint Etienne, France

¹University of Padua, Department of Surgery, Oncology and Gastroenterology, Gastroenterology Section, Padova, Italy, ²University of Padua, Department of Biotechnology, Verona, Italy, ³S.Maria del Prato Hospital, Department of Oncological Gastrointestinal Surgery, Feltre( BL), Italy, ⁴University of Padua, Department of Oncological Gastrointestinal Surgery, Padova, Italy, ⁵University of Padua, Department of Biology, Padova, Italy

¹King's College London, Nutritional Sciences Division, London, UK, ²Guy's and St Thomas' NHS Foundation Trust, Nutrition and Dietetics, London, UK, ³St George’s Hospital NHS Foundation Trust, Gastroenterology, London, UK, ⁴Guy's and St Thomas' NHS Foundation Trust, Colorectal Surgery, London, UK, ⁵Guy’s and St Thomas’ NHS Foundation Trust, Gastroenterology, London, UK

¹University of Medical Sciences, General, Endocrynological Surgery and Gastrointestinal Oncology, Poznań, Poland

¹The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China

¹Evangelismos Hospital, Gastroenterology Department, Athens, Greece, ²Medical School, National and Kapodistrian University of Athens, Department of Molecular Biology, Athens, Greece

¹St Vincent's Hospital, Gastroenterology, Melbourne, Australia, ²Alfred Health, Gastroenterology, Melbourne, Australia, ³Monash University Central Clinical School, Melbourne, Australia

¹Robarts Clinical Trials, Western University, London, Canada, ²Academic Medical Center, Amsterdam, The Netherlands, ³Celgene Corporation, Summit, USA, ⁴Mayo Clinic, Scottsdale, USA