1. STI Outpatient Clinic, Cluster Infectious Diseases, Municipal Health Service Amsterdam
2. Department of Dermatology, Academic Medical Center, University of Amsterdam
3. Centre for Infectious Diseases and Immunology Amsterdam (CINIMA), Amsterdam
4. Centre for Infectious Disease Control, National Institute of Public Health and the Environment, Bilthoven
5. Department of Pathology, Laboratory of Immunogenetics, VU University Medical Center, Amsterdam, The Netherlands
6. Department of Genitourinary Medicine, Guy's and St Thomas' NHS Foundation Trust, London, UK
7. Section of STI, Department of Rheumatology, Dermatology, and Infectious Diseases, Oslo University Hospital, and Faculty of Medicine, University of Oslo, Norway