1. Department of Gastroenterology and Hepatology; VU University Medical Centre; Amsterdam The Netherlands
2. Department of Gastroenterology, Geriatrics, Internal Medicine and Intensive Care Medicine (Co-MIK); Zuyderland Medical Centre; Heerlen-Geleen-Sittard The Netherlands
3. Dutch Crohn's and Colitis organisation (CCUVN); Woerden The Netherlands