1. University Hospital Essen; HPSTD Outpatient Clinic; Department of Dermatology and Venereology; Essen Germany
2. HELIOS St. Elisabeth Hospital Oberhausen; Department of Dermatology, Venereology, and Allergology; Oberhausen Germany
3. Augustinerinnen Hospital; Department of General Medicine; Gastroenterology; and Infectious Diseases; Cologne Germany
4. Ludwig-Maximilians-University; University Hospital Munich; Department of Gynecology; Munich Germany
5. Medical Specialist Practice for Hematology; Oncology; and Infectious Diseases; Karlsruhe Germany
6. City Hospital Karlsruhe; Department of Radiooncology and Radiation Therapy; Karlsruhe Germany
7. Medical Specialist Practice for Proctology; Kiel Germany
8. Ruhr-University, St. Josef Hospital, Department of Dermatology; Venereology, and Allergology, Center for Sexual Health und Medicine; Bochum Germany
9. Cytologic Institute; Bensberg Germany
10. Cytologic Institute; Bonn Bad Godesberg; Germany
11. Prinzmed Medical Practice; Munich Germany
12. University Hospital Hamburg-Eppendorf; Outpatient Clinic Center for Infectious Diseases; Hamburg Germany
13. Medical Practice Center of General Medicine; Vienna Austria
14. Medical Group Practice; Berlin Germany
15. Medical Practice for Internal Medicine and Infectious Diseases; Aachen Germany
16. Medical Group Practice for Internal Medicine and Rheumatology; Freiburg Germany
17. ICH; Hamburg Germany
18. Deutsche AIDS Hilfe; Berlin Germany
19. University Köln; Institute of Virology; National Reference Center for Papilloma and Polyomavirus; Cologne Germany