1. Department of Gastroenterology and Hepatology; Academic Medical Centre; Amsterdam The Netherlands
2. Foundation PALGA (the nationwide network and registry of histo- and cytopathology in the Netherlands); Houten The Netherlands
3. Department of Gastroenterology and Hepatology; Erasmus University Medical Centre; Rotterdam The Netherlands
4. Department of Pathology; Radboud University Medical Centre; Nijmegen The Netherlands