1. Amsterdam UMC, Amsterdam Medical Center, University of Amsterdam, Department of Gastroenterology and Hepatology, Amsterdam, The Netherlands
2. Amsterdam UMC, VU Medical Center, VU University, Department of Pathology, Amsterdam, The Netherlands
3. University Hospitals Leuven, University of Leuven, Department of Pathology, Leuven, Belgium
4. Amsterdam UMC, Amsterdam Medical Center, University of Amsterdam, Department of Surgery, Amsterdam, The Netherlands