1. Department of Microbiology and Immunology and Center for AIDS Research, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
2. Duke University Medical Center, Duke Human Vaccine Institute, Durham, North Carolina, USA
3. Gillings School of Public Health and Center for AIDS Research, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
4. California National Primate Research Center, University of California at Davis, Davis, California, USA
5. Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA
6. Department of Pediatrics, Duke University Medical Center, Durham, North Carolina, USA