1. STD Clinic; Hôpital Saint-Louis AP-HP and Hôpital Saint-Joseph; Paris France
2. Department of Pediatric Dermatovenereology; Comenius University; Bratislava Slovak Republic
3. Syphilis National Reference Center; Hôpital Tarnier-Cochin; AP-HP; Paris France
4. WHO Collaborating Centre for Gonorrhoea and other Sexually Transmitted Infections; Department of Laboratory Medicine; Microbiology; Örebro University Hospital; Örebro Sweden
5. 2nd Dermatological Clinic; Carol Davila University; Colentina Clinical Hospital; Bucharest Romania
6. Department of Dermatovenereology; University Medical Centre; Ljubljana Slovenia
7. Central and North West London NHS Trust and University College; London UK
8. Department of Genitourinary Medicine; the Royal South Hants Hospital; Southampton UK