1. Genitourinary Medicine, London North West Healthcare NHS Trust, London, UK
2. Klinik für Dermatologie, Venerologie und Allergologie, Ruhr-Universität Bochum, Bochum, Germany
3. Department of Bloodborne Infections, Sanquin Blood Supply, Amsterdam, Netherlands
4. Novopraxis Berlin GbR, Berlin, Germany
5. Sandyford Sexual Health Services, Glasgow, UK