1. Department of Genitourinary Medicine
2. Southampton Medical School, Southampton
3. Department of Virology, University College London, London, UK
4. Department of Dermatovenerology, University of Bergen, Bergen, Norway
5. Dermatologisches Ambulatorium Triemli, Zurich, Switzerland
6. Central and North West London NHS Trust, London, UK
7. Department of Dermatology, Erasmus Medical Centre, Rotterdam, The Netherlands
8. Department of Dermatology and Venereology, Moscow State University for Medicine and Dentistry, Moscow, Russia
9. Department of Venereology, University of Oslo, Oslo, Norway