1. Division of Infectious Diseases and Infection Control, Cantonal Hospital St Gallen, Switzerland / Communicable Diseases Division, Swiss Federal Office of Public Health, Bern, Switzerland
2. Division of Infectious Diseases and Infection Control, Cantonal Hospital St Gallen, Switzerland
3. PROFA – Consultations in Sexual Health, Renens, Switzerland
4. Checkpoint Vaud, Lausanne, Switzerland
5. Risch Medical Laboratories, Buchs, Switzerland
6. labormedizinisches zentrum Dr Risch AG, Buchs, Switzerland
7. Department of Infectious Diseases, Bern University Hospital, University of Bern, Switzerland
8. Division of Infectious Diseases and Hospital Epidemiology, University Hospital Basel and University Basel, Switzerland
9. Swiss AIDS Federation, Zurich, Switzerland
10. Checkpoint Basel, Switzerland
11. Division of Infectious Diseases and Infection Control, Cantonal Hospital St. Gallen, Switzerland