1. Inflammatory Bowel Disease Center, Section of Gastroenterology and Hepatology, Dartmouth-Hitchcock Medical Center , Lebanon, New Hampshire , USA
2. Department of Gastroenterology, CHU Liège University Hospital , Liège , Belgium
3. Department of Biomedical Sciences, Humanitas University, IRCCS Humanitas Research Hospital , Milan , Italy
4. Kennedy Institute of Rheumatology, Translational Gastroenterology Unit, and Biomedical Research Centre, University of Oxford , Oxford , UK
5. Department of Gastroenterology, Oslo University Hospital, Institute of Clinical Medicine, University of Oslo , Oslo , Norway
6. Department of Psychiatry, Section of Gastroenterology & Hepatology, Dartmouth-Hitchcock Medical Center , Lebanon, New Hampshire , USA
7. Department of Gastroenterology, Faculty of Medicine and Health, Örebro University , Örebro , Sweden
8. Department of Medicine, University of Calgary , Calgary, Alberta , Canada
9. Department of Community Health Sciences, University of Calgary , Calgary, Alberta , Canada
10. Department of Pediatrics, Susan and Leonard Feinstein IBD Center, Icahn School of Medicine , Mount Sinai, New York, New York , USA
11. Department of Gastroenterology, North Zealand Hospital, University of Copenhagen , Hillerød , Denmark