1. Department of Gastroenterology and Hepatology, Erasmus MC Cancer Institute, University Medical Center, Rotterdam, The Netherlands
2. Department of Gastroenterology and Hepatology, Cancer Center Amsterdam, Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centers, Amsterdam, The Netherlands
3. Department of Gastroenterology and Hepatology, Ijsselland Hospital, Capelle aan den Ijssel, The Netherlands
4. Department of Gastroenterology and Hepatology, Haga Teaching Hospital, Den Haag, The Netherlands
5. Department of Gastroenterology and Hepatology, Catharina Hospital, Eindhoven, The Netherlands