1. Department of Gastroenterology and Hepatology, University Medical Center, Utrecht, Utrecht, The Netherlands
2. Department of Gastroenterology and Hepatology, University of Groningen and University Medical Center Groningen, Groningen, The Netherlands
3. Department of Genetics, University of Groningen and University Medical Center Groningen, Groningen, The Netherlands
4. Julius Center for Health Sciences and Primary Care, University Medical Center, Utrecht, Utrecht, the Netherlands
5. Department of Gastroenterology and Hepatology, Amsterdam Medical Center, Amsterdam, The Netherlands
6. Department of Gastroenterology and Hepatology, University Medical Center St. Radboud, Nijmegen, The Netherlands
7. Department of Gastroenterology and Hepatology, Leiden University Medical Center, Leiden, The Netherlands
8. Department of Gastroenterology and Hepatology, University Medical Center Maastricht, Maastricht, The Netherlands
9. Department of Gastroenterology and Hepatology, VU University Medical Center, Amsterdam, The Netherlands
10. Department of Gastroenterology and Hepatology, Erasmus Medical Center, Rotterdam, The Netherlands
11. Department of Gastroenterology and Hepatology (Co-MIK), Zuyderland Medical Center, Sittard-Geleen, The Netherlands
12. Department of Gastroenterology and Hepatology, Diaconessenhuis, Leiden, The Netherlands
13. Department of Gastroenterology and Hepatology, Slingeland Hospital, Doetinchem, The Netherlands
14. Department of Gastroenterology and Hepatology, Antonius Hospital, Nieuwegein, The Netherlands
15. Department of Gastroenterology and Hepatology, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands
16. Department of Gastroenterology and Hepatology, Meander Medical Center, Amersfoort, The Netherlands