1. Gastroenterology and Hepatology, Isala Hospital, 8025 AB Zwolle, The Netherlands
2. Department of Epidemiology and Statistics, Isala Hospital, 8025 AB Zwolle, The Netherlands
3. Abdominal Surgery, Isala Hospital, 8025 AB Zwolle, The Netherlands
4. Isala Oncology Center, Isala Hospital, 8025 AB Zwolle, The Netherlands
5. Gastroenterology and Hepatology, Universitair Medisch Centrum Utrecht, 3584 CX Utrecht, The Netherlands