1. Department of Gastroenterology and Hepatology; Academic Medical Center; Amsterdam the Netherlands
2. Clinical Research Unit; Academic Medical Center; Amsterdam the Netherlands
3. Department of Gastroenterology and Hepatology; University Medical Center Utrecht; Utrecht the Netherlands
4. Department of Gastroenterology and Hepatology; Rijnstate Hospital; Arnhem the Netherlands
5. Department of Gastroenterology and Hepatology; Isala Clinics; Zwolle the Netherlands
6. Department of Gastroenterology and Hepatology; VU Medical Center; Amsterdam the Netherlands
7. Department of Gastroenterology and Hepatology; Gelderse Vallei Hospital; Ede the Netherlands
8. Department of Gastroenterology and Hepatology; Medical Center Alkmaar; Alkmaar the Netherlands
9. Department of Gastroenterology and Hepatology; Tergooiziekenhuizen; Hilversum/Blaricum the Netherlands