1. Department of Medicine, Duke University School of Medicine, Durham, North Carolina 27707; Duke Center for AIDS Research and the Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina 27707.
2. Department of Medicine, Duke University School of Medicine, Durham, North Carolina 27707.
3. Department of Medicine, Duke University School of Medicine, Durham, North Carolina 27707Duke Center for AIDS Research and the Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina 27707.
4. Tulane University, New Orleans, Louisiana 70118.
5. Department of Medicine, Duke University School of Medicine, Durham, North Carolina 27707; Duke Center for AIDS Research and the Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina 27707; Department of Immunology, Duke University School of Medicine, Durham, North Carolina 27707.