1. Division of Infectious Diseases and Hospital Epidemiology; University Hospital, Zurich; University of Zurich; Zurich Switzerland
2. Division of Infectious Diseases; Department of Internal Medicine; University Hospital; Basel Switzerland
3. Division of Infectious Diseases; University Hospital and University of Bern; Bern Switzerland
4. St-Martin Addiction Medicine Center; Service of Community Psychiatry; University Hospital; Centre hospitalier universitaire vaudois; Lausanne Switzerland
5. Division of Infectious Diseases; University Hospital; Hôpitaux Universitaires de Genève; Geneva Switzerland
6. Division of Infectious Diseases and Hospital Epidemiology; Department of Internal Medicine; Cantonal Hospital; St. Gallen Switzerland
7. Division of Infectious Diseases; Department of Internal Medicine; Ospedale Regionale; Lugano Switzerland
8. Swiss HIV Cohort Study Data Center; University Hospital and University of Lausanne; Lausanne Switzerland