1. Division of Infectious Diseases, Centre Hospitalier Universitaire Vaudois, 1011 Lausanne, Switzerland.
2. Institute of Microbiology, Centre Hospitalier Universitaire Vaudois, 1011 Lausanne, Switzerland.
3. Swiss HIV Cohort Data Center, Centre Hospitalier Universitaire Vaudois, 1011 Lausanne, Switzerland.
4. Division of Infectious Diseases and Institute of Microbiology, Centre Hospitalier Universitaire Vaudois, 1011 Lausanne, Switzerland.