1. Department of Surgery, Amsterdam University Medical Center, Location AMC, Amsterdam, the Netherlands;
2. Department of Gastroenterology and Hepatology, Amsterdam University Medical Center, Location AMC, Amsterdam, the Netherlands;
3. Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium;
4. Department of Surgery, University Hospitals Leuven, Leuven, Belgium;
5. Institute of Pathology, University of Bern, Bern, Switzerland.