1. Department of Otorhinolaryngology / Head and Neck Surgery; University of Bonn; Germany
2. Department of Prostate Cancer Research; University of Bonn; Bonn Germany
3. Institute of Pathology; University of Bonn; Bonn Germany
4. Winchester Medical Center; Winchester Virginia
5. Institute of Pathology; University of Cologne; Cologne Germany
6. Institute of Pathology; University of Erlangen; Erlangen Germany
7. Laboratory for Dermatohistology and Oral Pathology, Institute of Pathology; Ludwig Maximilian University of Munich; Munich Germany
8. Medical Center II; University of Tuebingen; Tuebingen Germany