1 Inflammatory Bowel Disease Center, Department of Gastroenterology, Radboud University Medical Center, Nijmegen, The Netherlands. Electronic address: maarten.tegroen@radboudumc.nl.
2 Inflammatory Bowel Disease Center, Department of Gastroenterology, Radboud University Medical Center, Nijmegen, The Netherlands.
3 PALGA Foundation (The Nationwide Network and Registry of Histo- and Cytopathology), Houten, The Netherlands.
4 Department of Pathology, Radboud University Medical Center, Nijmegen, The Netherlands.