1. Department of Gastroenterology and Hepatology, St. Antonius Hospital, Nieuwegein, the Netherlands
2. Department of Gastroenterology and Hepatology, Amsterdam University Medical Centers, the Netherlands
3. Department of Gastroenterology and Hepatology, University Medical Center Utrecht, Utrecht University, the Netherlands
4. Pathology DNA, St. Antonius Hospital, Nieuwegein, the Netherlands
5. Department of Gastroenterology and Hepatology, University Medical Center Groningen, the Netherlands
6. Department of Gastroenterology and Hepatology, Catharina Hospital Eindhoven, the Netherlands