1. Infectious Diseases Service, Department of Medicine, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Switzerland.
2. The Reproductive Health and HIV Research Unit, University of the Witwatersrand, Johannesburg, South Africa.
3. Data Coordination Center for the Swiss HIV Cohort, Lausanne, Switzerland.
4. Hopital Cantonal et Universitaire de Genève, Service des Maladies Infectieuses, Geneva, Switzerland.
5. University of Basel, Medicine, Division of Infectious Diseases, Basel, Switzerland.
6. Universitätsspital Bern, Klinik und Poliklinik für Infektiologie, Bern, Switzerland.
7. University Hospital Zürich, Division of Infectious Diseases and Hospital Epidemiology, University of Zürich, Switzerland.
8. Ospedale, Civico, Department of Medicine, Division of Infectious Diseases, Lugano, Switzerland.
9. Kantonsspital St. Gallen, Switzerland.