1. STI outpatient clinic, Cluster Infectious Diseases, Health Service Amsterdam, Amsterdam, The Netherlands
2. Department of Dermatology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
3. Centre for Infectious Diseases and Immunology Amsterdam (CINIMA), Amsterdam, The Netherlands
4. Centre for Infectious Disease Control, National Institute of Public Health and the Environment, Bilthoven, The Netherlands
5. Department of Biomedical Sciences and Human Oncology, Dermatologic Clinic, University of Turin, Turin, Italy
6. Department of Genitourinary Medicine, Guy's and St Thomas' NHS Foundation Trust, London, UK
7. Sexual Health Clinic – University Hospitals Birmingham NHS Foundation Trust, Whittall Street Clinic, Birmingham, UK
8. Department of Dermatology, Venereology, and Allergology, HELIOS St. Elisabeth Hospital Oberhausen, Germany