1. Department of Pathology; Radboud University Medical Centre; Nijmegen The Netherlands
2. Department of Pathology; University Medical Center Utrecht; Utrecht The Netherlands
3. Princess Máxima Center for Pediatric Oncology; Utrecht The Netherlands
4. Dermatopathology Bodensee; Friedrichshafen Germany
5. Department of Pathology; Rijnstate Hospital; Arnhem The Netherlands
6. Department of Pathology; Diakonessenhuis Utrecht; Utrecht The Netherlands
7. Department of Pathology; Ghent University Hospital, Ghent University; Ghent Belgium