1. Department of Pathology, Josephine Nefkens Institute, Erasmus University Rotterdam, PO Box 1738, 3000 DR Rotterdam, The Netherlands
2. Department of Surgery, Erasmus University Rotterdam, PO Box 1738, 3000 DR Rotterdam, The Netherlands
3. Department of Gastroenterology and Liver Diseases, Erasmus University Rotterdam, PO Box 1738, 3000 DR Rotterdam, The Netherlands