1. Gastroenterology and Endoscopy, IRCCS Ospedale San Raffaele and Vita-Salute San Raffaele University , Milan , Italy
2. Department of Biomedical Sciences, Humanitas University , Pieve Emanuele, Milan , Italy
3. Center for Health Technology and Services Research (CINTESIS), Faculty of Medicine of the University of Porto , Porto , Portugal
4. Medizinische Klinik m. S. Gastroenterologie, Infektiologie und Rheumatologie, Charité, Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin , Berlin , Germany
5. Center for Advanced IBD Research and Treatment, Kitasato University Kitasato Institute Hospital , Tokyo , Japan
6. Colorectal Surgery Unit, Hospital Universitário Cajuru, Pontifícia Universidade Católica do Paraná (PUCPR) , Curitiba , Brazil
7. Department of Medicine, Division of Gastroenterology, Western University , London, Ontario , Canada
8. University of Lorraine, CHRU-Nancy, Department of Gastroenterology , F-54000 Nancy , France
9. University of Lorraine, Inserm, NGERE , F-54000 Nancy , France
10. Digestive Diseases Unit, Rashid Hospital , Dubai 003206 , United Arab Emirates
11. St Mark’s Hospital , Harrow , Middlesex , UK
12. Department of Medicine I, Agaplesion Markus Hospital, Goethe-University , Frankfurt am Main , Germany