1. Department of Gastroenterology and Hepatology, Erasmus University Medical Center, Rotterdam, the Netherlands;
2. Department of Research and Development, St. Antonius Hospital, Nieuwegein, the Netherlands;
3. Amsterdam UMC, location University of Amsterdam, Department of Surgery, Amsterdam, the Netherlands;
4. Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam, the Netherlands;
5. Department of statistics, St. Antonius Hospital, Nieuwegein, the Netherlands;
6. Department of Surgery, St. Antonius Hospital, Nieuwegein, the Netherlands;
7. Department of Surgery, University Medical Center Utrecht, Utrecht, the Netherlands;
8. Department of Gastroenterology and Hepatology, St. Antonius Hospital, Nieuwegein, the Netherlands.