1. Department of Gastroenterology and Hepatology; Utrecht University Medical Center; Utrecht The Netherlands
2. Department of Gastroenterology and Hepatology; St Antonius Hospital; Nieuwegein The Netherlands
3. Department of Clinical Genetics; Utrecht University Medical Center; Utrecht The Netherlands
4. Department of Pathology; Utrecht University Medical Center; Utrecht The Netherlands
5. Department of Gastroenterology and Hepatology; Radboud University Medical Center; Nijmegen The Netherlands