1. Department of Genitourinary Medicine, Churchill Hospital, Oxford, UK
2. Department of Obstetrics and Gynecology, Regional Hospital H Hart Tienen, University Hospital Gasthuisberg Leuven, and University Hospital Citadelle Liège, Belgium
3. The Department of Sexual Medicine, Birmingham Heartlands Hospital, Heart of England NHS Teaching Trust, Birmingham, UK
4. STI Research and Development, Statens Serum Institut, Copenhagen, Denmark