1. Department of Dermatology, Division of Immunology, Allergy and Infectious Diseases, Medical University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna
2. Department of PublicHealth, Out-Patient Clinic for the Diagnosis and Treatment ofSexually Transmitted Diseases
3. Centre for Sexually TransmittedDiseases, Department of Dermatology, State Hospital of the Cityof Vienna, Lainz
4. Department of Dermatology, Division of Immunology, Allergyand Infectious Diseases, Medical University of Vienna,Währinger Gürtel 18-20, A-1090 Vienna
5. Department of Dermatology, Division of Immunology, Allergyand Infectious Diseases, Medical University of Vienna,Währinger Gürtel 18-20, A-1090 Vienna and Ludwig Boltzmann Institute for Research onVeneral Diseases, Vienna,
Austria