1. University of Colorado-AMC, Aurora, Colorado, USA
2. Infectious Diseases Service, Lausanne University Hospital, Lausanne, Switzerland
3. School of Pharmaceutical Sciences and Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Geneva, Switzerland
4. Department of Infectious Diseases, Bern University Hospital, Inselspital, University of Bern, Bern, Switzerland
5. Division of Infectious Diseases, HIV/AIDS Unit, Geneva University Hospitals, Geneva, Switzerland
6. University of Basel, Basel, Switzerland
7. Division of Infectious Diseases, University Hospital Basel, Basel, Switzerland
8. Division of Infectious Diseases, Kantonsspital St. Gallen, St. Gallen, Switzerland
9. Division of Infectious Diseases, Ospedale Regionale di Lugano, Lugano, Switzerland
10. Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
11. Institute of Medical Virology, University of Zurich, Zurich, Switzerland
12. Department of Medicine, Swiss Tropical and Public Health Institute, Basel, Switzerland