1. Department of Genitourinary Medicine, Jefferiss Wing, St Mary's Hospital, London
2. Department of Social Science and Medicine, Imperial College School of Medicine, London, UK
3. Department of Epidemiology and Social Medicine, University of Antwerp, Antwerp, Belgium
4. Task Force on STI Epidemics in CCEE, Sexually Transmitted Infections/HIV/AIDS Programme, WHO Regional Office for Europe, Copenhagen, Denmark