1. Department of Gastroenterology and Hepatology, Reinier de Graaf Gasthuis, Delft, the Netherlands
2. Department of Cyto- and Histopathology, Reinier de Graaf Gasthuis, Delft, the Netherlands
3. Department of Gastroenterology and Hepatology, Franciscus Gasthuis en Vlietland, Rotterdam, the Netherlands
4. Department of Cyto- and Histopathology, Pathan B.V., Rotterdam, the Netherlands
5. Department of Gastroenterology and Hepatology, Albert Schweitzer Ziekenhuis, Dordrecht, the Netherlands
6. Department of Cyto- and Histopathology, PAL Dordrecht, Dordrecht, the Netherlands
7. Department of Gastroenterology and Hepatology, Maasstad Ziekenhuis, Rotterdam, the Netherlands
8. Department of Cyto- and Histopathology, Maasstad Ziekenhuis, Rotterdam, the Netherlands
9. Department of Gastroenterology and Hepatology, IJsselland Ziekenhuis, Capelle aan den Ijssel, the Netherlands
10. Department of Biostatistics, Erasmus Medical Center, Rotterdam, the Netherlands
11. Department of Gastroenterology and Hepatology, Erasmus Medical Center, Rotterdam, the Netherlands