1. Department of Pathology; Radboud University Nijmegen Medical Centre; Nijmegen; The Netherlands
2. Jules Bordet Institute; Brussels; Belgium
3. Department of Pathology; Academic Medical Center; Amsterdam; The Netherlands
4. Department of Pathology; Ghent University Hospital; Ghent; Belgium
5. Department of Pathology and Medical Biology; University Medical Centre Groningen; Groningen; The Netherlands
6. Dermatopathologie Bodensee; Friedrichshafen; Germany