1. The Wistar Institute, Philadelphia, Pennsylvania, USA.
2. Centre de Recherche du CHUM and Department of Microbiology, Infectiology and Immunology, Université de Montréal, Montreal, Canada.
3. Merck, Inc., West Point, Pennsylvania, USA.
4. School of Biological Sciences and Nebraska Center for Virology, University of Nebraska, Lincoln, Nebraska, USA.
5. Jonathan Lax Immune Disorders Treatment Center, Philadelphia Field Initiating Group for HIV-1 Trials, Philadelphia, Pennsylvania, USA.
6. John Bell Health Center, Philadelphia Field Initiating Group for HIV-1 Trials, Philadelphia, Pennsylvania, USA.
7. University of Pennsylvania, Department of Medicine, Philadelphia, Pennsylvania, USA.