Affiliation: | Department of Genitourinary Medicine and Communicable Diseases, St Mary's Hospital Medical School, London;Department of Genitourinary Medicine and Communicable Diseases, St Mary's Hospital Medical School and Department of Obstetrics and Gynaecology, Chelsea and Westminster Hospital, London;Department of Obstetrics and Gynaecology, Charing Cross and Westminster Medical School, Chelsea and Westminster Hospital, London |