1. Department of Radiology, Medical Center Alkmaar, Alkmaar, The Netherlands
2. Department of Gastroenterology, Medical Center Alkmaar, Alkmaar, The Netherlands
3. Departments of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
4. Department of Gastroenterology, St Antonius Hospital Nieuwegein, Nieuwegein, The Netherlands
5. Department of Gastroenterology, Deventer Ziekenhuis, Deventer, The Netherlands
6. Department of Radiology, Academic Medical Center, Amsterdam, The Netherlands
7. Internal Medicine, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands