J. Burisch*¹, U. Gerdes^2,3, S. Almer⁴, S. Čuković-Čavka⁵, S. Sebastian⁶, I. Kaimakliotis⁷, D. Duricova⁸, N. Pedersen⁹, R. Salupere¹⁰, K. R. Nielsen^11,12, P. Manninen¹³, K. H. Katsanos¹⁴, S. Odes¹⁵, V. Andersen^16,17, R. D’Inca¹⁸, L. Kupcinskas¹⁹, S. Turcan²⁰, F. Magro^{21, 22, 23}, A. Goldis²⁴, K. Kofod Vinding²⁵, E. Belousova²⁶, K. Ladefoged²⁷, Y. Bailey²⁸, V. Hernandez²⁹, J. Halfvarson³⁰, N. Arebi³¹, O. Shonova³², M. L. Hoivik³³, B. Moum³⁴, E. Langholz³⁵, P. L. Lakatos³⁶, P. Munkholm¹, J. F. Dahlerup³⁷

¹North Zealand University Hospital, Department of Gastroenterology, Frederikssund, Denmark, ²Region of Southern Denmark, Centre for Quality, Middelfart, Denmark, ³University of Southern Denmark, Institute of Regional Health Research, Odense, Denmark, ⁴County council of Östergötland, Department of Gastroenterology/UHL, Linköping, Sweden, ⁵University Hospital Centre Zagreb, University of Zagreb School of Medicine, Division of Gastroenterology and Hepatology, Zagreb, Croatia, ⁶Hull Royal Infirmary, Hull and East Yorkshire NHS Trust & Hull and York Medical School, Hull, United Kingdom, ⁷Nicosia Private practice, Nicosia Private practice, Nicosia, Cyprus, ⁸Charles University, IBD Centre ISCARE, Prague, Czech Republic, ⁹Slagelse Hospital, Department of Gastroenterology, Slagelse, Denmark, ¹⁰Tartu University Hospital, Division of Endocrinology and Gastroenterology, Tartu, Estonia, ¹¹The National Hospital of the Faroe Islands, Medical department, Tórshavn, Faroe Islands, ¹²Genetic Biobank, Tórshavn, Faroe Islands, ¹³Tampere University Hospital, Department of Gastroenterology and Alimentary Tract Surgery, Tampere, Finland, ¹⁴University Hospital, Ioannina, 1st Division of Internal Medicine and Hepato-Gastroenterology Unit, Ioannina, Greece, ¹⁵Soroka Medical Centre and Ben-Gurion University of the Negev, Department of Gastroenterology and Hepatology, Beer Sheva, Israel, ¹⁶Viborg Regional Hospital, Medical Department, Viborg, Denmark, ¹⁷Hospital of Southern Jutland, Medical Department, Aabenraa, Denmark, ¹⁸On behalf of the EpiCom Northern Italy, Florence, Forlì, and Padova, Northern Italy, Italy, ¹⁹Lithuanian University of Health Sciences, Institute for Digestive Research, Kaunas, Lithuania, ²⁰State University of Medicine and Pharmacy of the Republic of Moldova, Department of Gastroenterology, Chisinau, Moldova, Republic of, ²¹University of Porto, Institute for molecular and cell biology, Porto, Portugal, ²²Hospital de São João, Department of Gastroenterology, Porto, Portugal, ²³Oporto Medical School, Institute of Pharmacology and Therapeutics, Porto, Portugal, ²⁴University of Medicine ‘Victor Babes’, Clinic of Gastroenterology, Timisoara, Romania, ²⁵Amager Hospital, Department of medicine, Amager, Denmark, ²⁶Moscow Regional Research Clinical Institute, Department of Gastroenterology, Moscow, Russian Federation, ²⁷Dronning Ingrids Hospital, Medical Department, Nuuk, Greenland, ²⁸Adelaide and Meath Hospital, TCD, Department of Gastroenterology, Dublin, Ireland, ²⁹Complexo Hospitalario Universitario de Vigo, Gastroenterology Department, Vigo, Spain, ³⁰Faculty of Medicine and Health, Örebro University, Department of Gastronterology, Örebro, Sweden, ³¹St Mark’s Hospital, Gastroenterology, London, United Kingdom, ³²Nemocnice Ceske Budejovice, Department of Gastroenterology, Ceske Budejovice, Czech Republic, ³³Oslo University Hospital, Department of Gastroenterology, Oslo, Norway, ³⁴Oslo University Hospital, Department of Gastroenterology, Oslo, Norway, ³⁵Gentofte Hospital, Department of Medical Gastroenterology, Copenhagen, Denmark, ³⁶Semmelweis University, 1st Department of Medicine, Budapest, Hungary, ³⁷Aarhus University Hospital, Department of Hepatology and Gastroenterology, Aarhus, Denmark

B. P. M. Verhaegh*^{1, 2}, F. de Vries^{3, 4}, D. Keszthelyi¹, J. G. Kuiper⁵, A. A. M. Masclee^{1, 2}, M. J. Pierik¹, D.M.A.E. Jonkers^{1, 2}

¹Maastricht University Medical Centre+, Internal Medicine - Division of Gastroenterology-Hepatology, Maastricht, Netherlands, ²Maastricht University Medical Centre+, NUTRIM, School of Nutrition and Translational Research in Metabolism, Maastricht, Netherlands, ³Utrecht Institute of Pharmaceutical Sciences, Division of Pharmacoepidemiology and Clinical Pharmacology, Utrecht, Netherlands, ⁴Maastricht University Medical Centre+, Department of Clinical Pharmacology & Toxicology, Maastricht, Netherlands, ⁵PHARMO Institute of Drug Outcomes Research, Utrecht, Netherlands

M. L. Hoivik*¹, B. Moum², T. Glomsaker³

¹Oslo University Hospital, Department of Gastroenterology, Oslo, Norway, ²Oslo University Hospital, Department of Gastroenterology, Oslo, Norway, ³Oslo University Hospital, Department of Surgery, Oslo, Norway

Z. Kurti*¹, L. Gonczi¹, P. A. Golovics¹, B. Lovasz¹, P. Fadgyas-Freyler², J. Gimesi-Orszagh², G. B. Korponai², Z. Vegh¹, P. Lakatos¹

¹Semmelweis University, First Department of Medicine, Budapest, Hungary, ²National Health Insurance Fund (OEP), Strategic Analysis Department, Budapest, Hungary

D. Hoekman*¹, S. Bots², M. Benninga¹, H. Smeets³, G. D’Haens², M. Löwenberg²

¹Academic Medical Centre (AMC), Department of Paediatric Gastroenterology, Amsterdam, Netherlands, ²Academic Medical Centre (AMC), Department of Gastroenterology, Amsterdam, Netherlands, ³Achmea Health Insurance, Amersfoort, Netherlands

L. M. Spekhorst*^{1, 2}, F. Imhann^{1, 2}, E. A. M. Festen^{1, 2}, A. A. van Bodegraven³, N. K. H. de Boer³, G. Bouma³, H. H. Fidder⁴, G. R. A. M. D’Haens⁵, F. Hoentjen⁶, D. W. Hommes⁷, D. J. de Jong⁶, M. Lowenberg⁵, A.E. van der Meulen-de Jong⁷, B. Oldenburg⁴, M. Pierik⁸, C.Y. Ponsioen⁵, P.C. Stokkers⁹, M. C. Visschedijk^{1, 2}, C. J. van der Woude¹⁰, G. Dijkstra¹, R. K. Weersma¹

¹University of Groningen and University Medical Centre Groningen, Department of Gastroenterology and Hepatology, Groningen, Netherlands, ²University of Groningen and University Medical Centre Groningen, Department of Genetics, Groningen, Netherlands, ³VU University Medical Centre, Department of Gastroenterology and Hepatology, Amsterdam, Netherlands, ⁴University Medical Centre Utrecht, Department of Gastroenterology and Hepatology, Utrecht, Netherlands, ⁵Amsterdam Medical Centre, Department of Gastroenterology and Hepatology, Amsterdam, Netherlands, ⁶University Medical Centre St Radboud, Department of Gastroenterology and Hepatology, Nijmegen, Netherlands, ⁷Leiden University Medical Centre, Department of Gastroenterology and Hepatology, Leiden, Netherlands, ⁸University Medical Centre Maastricht, Division of Gastroenterology and Hepatology, Maastricht, Netherlands, ⁹St Lucas Andreas Ziekenhuis, Department of Gastroenterology and Hepatology, Amsterdam, Netherlands, ¹⁰Erasmus Medical Centre, Department of Gastroenterology and Hepatology, Rotterdam, Netherlands

M. Genin*^{1, 2}, C. Vignal^{1, 3}, F. Vasseur², M. Fumery⁴, G. Savoye⁵, M. Body-Malapel^{1, 3}, C. Preda⁶, H. Sarter⁷, L. Peyrin-Biroulet⁸, P. Desreumaux^{3, 9}, C. Gower-Rousseau^{1, 7, 10}

¹University Hospital, Lille, France, ²CHRU Lille, Department of Biostatistics EA 2694, Lille, France, ³Inserm 995 LIRIC Team 5, Lille, France, ⁴University Hospital, Gastroenterology, Amiens, France, ⁵University Hospital, Gastroenterology, Rouen, France, ⁶UFR de Mathématiques, Lille, France, ⁷University, Inserm 995 LIRIC Team 5, Lille, France, ⁸University Hospital, Gastroenterology, Nancy, France, ⁹University Hospital, Gastroenterology, Lille, France, ¹⁰CHRU Lille, Department of Epidemiology, EPIMAD Registry, Lille, France

I. Rodríguez-Lago*^{1, 2}, O. Merino^{2, 3}, J. Carrascosa^{2, 4}, M. Fernández - 
Calderón^{2, 5}, A. Maiz^{2, 6}, A. Muñagorri^{2, 7}, P. Arreba^{2, 8}, R. Higuera^{2, 9}, E. Zapata^{2, 10}, I. Moraleja^{1, 2}, I. Montalvo^{2, 11}, I. Portillo¹², J. L. Cabriada^{1, 2}

¹Galdakao Hospital, Gastroenterology, Galdakao, Spain, ²IBD Study Group of the Basque – Navarre Society of Gastrointestinal Diseases, Pais Vasco - Navarra, Spain, ³Cruces University Hospital, Gastroenterology, Bilbao, Spain, ⁴Zumárraga Hospital, Gastroenterology, Zumárraga, Spain, ⁵Mondragon - Alto Deba Hospital, Gastroenterology, Mondragón, Spain, ⁶Donostia Hospital, Microbiology, Donostia, Spain, ⁷Donostia Hospital, Gastroenterology, Donostia, Spain, ⁸Basurto University Hospital, Gastroenterology, Bilbao, Spain, ⁹San Eloy Hospital, Gastroenterology, Bilbao, Spain, ¹⁰Mendaro Hospital, Gastroenterology, Mendaro, Spain, ¹¹Onkologikoa Hospital, Gastroenterology, Donostia, Spain, ¹²Basque Country Health Service, Colorectal cancer screening programme, Bilbao, Spain

L. Christiansen*, F. Bendtsen, J. Burisch, M. Kajbaek Vester-Andersen

Hvidovre University Hospital, Department of Gastroenterology, Hvidovre, Denmark

E. Bequet¹, H. Sarter², M. Fumery³, L. Armengol-Debeir⁴, B. Pariente⁵, D. Ley⁶, C. Spyckerelle⁷, H. Coevoet⁸, L. Peyrin-Biroulet⁹, G. Savoye*¹⁰, T. Dominique⁶, C. Gower-Rousseau¹¹

¹Centre Hospitalier Régional Universitaire, Gastroentérologie pédiatrique, Lille, France, ²Chru, Epidémiologie, Lille, France, ³Université d’Amiens, Gastroentérologie, Amiens, France, ⁴Université de Rouen, Gastroentérologie, Rouen, France, ⁵chru, Gastoentérologie, Lille, France, ⁶Chru, Gastroentérologie pédiatrique, Lille, France, ⁷Hopital Saint-Vincent - Université catholique, Pédiatrie, Lille, France, ⁸Hôpital Les bonnettes, Arras, France, ⁹Chu, Gastroentérologie, Nancy, France, ¹⁰Chu Rouen, Gastroentérologie, Rouen, France, ¹¹Chru, Lille, France

F. Casellas*^{1, 2}, C. Herrera de Guise¹, V. Robles¹, N. Borruel¹

¹Hospital Universitari Vall d’Hebron, Unitat Atenció Crohn-Colitis, Barcelona, Spain, ²Hospital Universitari Vall d’Hebron, Barcelona, Spain

H. Kammerlander*¹, J. Nielsen¹, J. Kjeldsen², T. Knudsen³, S. Friedman⁴, B. Nørgård¹

¹University of Southern Denmark, Centre for Clinical Epidemiology, Odense, Denmark, ²University of Southern Denmark, Department of Medical Gastroenterology, Odense, Denmark, ³University of Southern Denmark, Department of Medical Gastroenterology, Esbjerg, Denmark, ⁴Massachusetts and Harvard Medical School, 4. Crohn’s and Colitis Centre, Brigham and Women’s Hospital, Boston, United States

L. Bajer*¹, E. Sticova², P. Macinga¹, R. Janousek³, P. Trunecka⁴, J. Spicak¹, P. Drastich¹

¹Institute for Clinical and Experimental Medicine, Hepatogastroenterology, Prague, Czech Republic, ²Institute for Clinical and Experimental Medicine, Pathology, Prague, Czech Republic, ³Institute for Clinical and Experimental Medicine, Radiology, Prague, Czech Republic, ⁴Institute for Clinical and Experimental Medicine, Transplantcentre, Prague, Czech Republic

J. Opstelten*¹, M. Leenders¹, V. Dik¹, S. Chan^{2, 3}, F. van Schaik¹, P. Siersema¹, B. Bueno-de-Mesquita^{1, 4, 5, 6}, A. Hart^{2, 3}, B. Oldenburg¹

¹University Medical Centre Utrecht, Department of Gastroenterology and Hepatology, Utrecht, Netherlands, ²Norfolk and Norwich University Hospital NHS Trust, Department of Gastroenterology, Norwich, United Kingdom, ³University of East Anglia, Norwich Medical School, Department of Medicine, Norwich, United Kingdom, ⁴National Institute for Public Health and the Environment (RIVM), Department for Determinants of Chronic Diseases, Bilthoven, Netherlands, ⁵Imperial College London, School of Public Health, Department of Epidemiology and Biostatistics, London, United Kingdom, ⁶University of Malaya, Faculty of Medicine, Department of Social and Preventive Medicine, Kuala Lumpur, Malaysia

M.-L. Rabilloud*¹, J.-F. Bretagne¹, E. Bajeux², L. Siproudhis³, J.-F. Viel², I. Tron⁴, M. Robaszkiewicz⁵, G. Bouguen¹

¹Université Rennes 1 & CHU Pontchaillou Rennes, Service des Maladies de l’Appareil Digestif, Rennes, France, ²CHU Pontchaillou, Service de Santé Publique, Rennes, France, ³Université Rennes 1 & CHU Pontchaillou Rennes, Service de chirurgie digestive, Rennes, France, ⁴ORSB, Rennes, France, ⁵CHU Brest, La Cavale Blanche, Service des Maladies de l’Appareil Digestif, Brest, France

J. C. Goet*¹, B. E. Hansen¹, K. Bierman², A. Gijsbers³, C. J. van der Woude¹, W. R. Schouten⁴, H. R. van Buuren¹, A.C. de Vries¹

¹Erasmus MC, Gastroenterology and Hepatology, Rotterdam, Netherlands, ²Erasmus MC, Pathology, Rotterdam, Netherlands, ³PALGA, Rotterdam, Netherlands, ⁴Erasmus MC, Surgery, Rotterdam, Netherlands

V. Pittet*¹, C. Vaucher¹, M. H. Maillard², F. Froehlich³, B. Burnand¹, P. Michetti⁴

¹Institute of Social and Preventive Medicine, Healthcare Evaluation Unit, Lausanne, Switzerland, ²Lausanne University Hospital, Department of Gastroenterology & Hepatology, Lausanne, Switzerland, ³University Hospital Basel, Division of Gastroenterology & Hepatology, Basel, Switzerland, ⁴Clinique La Source-Beaulieu, Crohn and Colitis Centre, Lausanne, Switzerland

P. Schreiner*¹, L. Biedermann², J.-B. Rossel³, V. Pittet⁴, R. von Känel⁵

¹UniversityHospital of Zurich, Internal Medicine, Zurich, Switzerland, ²UniversityHospital of Zurich, Gastroenterology and Hepatology, Zurich, Switzerland, ³Lausanne University Hospital, Lausanne, Switzerland, ⁴Lausanne University Hospital, Institute of Social & Preventive Medicine, Lausanne, Switzerland, ⁵Clinic Barmelweid, Department of Psychosomatic Medicine, Barmelweid, Switzerland

X. Calvet*¹, A. López-Sanromán², F. Argüelles-Arias³, L. Cea-Calvo⁴, B. Juliá⁴, C. Romero⁴, D. Carpio⁵

¹Corporació Sanitària Universitària Parc Taulí, Digestive Disease Department. Departament de Medicina. Universitat Autònoma de Barcelona. CIBEREHD – Instituto de Salud Carlos III, Sabadell, Spain, ²Hospital Ramón y Cajal, Gastroenterology and Hepatology Department, Madrid, Spain, ³Hospital Universitario Virgen Macarena, Gastroenterology Unit, Sevilla, Spain, ⁴Merck Sharp & Dohme de España, Medical Affairs, Madrid, Spain, ⁵Complexo Hospitalario Universitario, Gastroenterology Department, Instituto de Investigación Biomédica (IBI). Xerencia de Xestión Integrada de Pontevedra. SERGAS, Pontevedra, Spain

D. Chaaro*¹, J. M. Benitez², R. Perea Amarillo¹, F. Argüelles Arias¹, L. Castro Laria¹, M. B. Maldonado Perez¹, V. García Sanchez², E. Iglesias Flores², A. Benitez Roldan¹, A. Caunedo Álvarez¹

¹University Hospital Virgen Macarena, Gastroenterology and Hepatology Department, Seville, Spain, ²University Hospital Reina Sofía, Gastroenterology and Hepatology Department, Cordoba, Spain