1. Department of Gastroenterology and Hepatology, University Medical Center Utrecht, Utrecht, the Netherlands
2. Department of Pathology, University Medical Center Utrecht, Utrecht, the Netherlands
3. Department of Surgery, University Medical Center Utrecht, Utrecht, the Netherlands
4. Department of Gastroenterology and Hepatology, Radboud University Medical Center, Nijmegen, the Netherlands
5. Department of Gastroenterology and Hepatology, Antonius Hospital, Nieuwegein, the Netherlands
6. Department of Gastroenterology and Hepatology, Diakonessenhuis, Utrecht, the Netherlands