1. Department of Pediatrics, University of North Carolina at Chapel Hill
2. Department of Microbiology and Immunology, University of North Carolina at Chapel Hill
3. Department of Biostatistics, University of North Carolina at Chapel Hill
4. Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh School of Medicine and the Magee-Womens Research Institute Pittsburgh, Pennsylvania
5. Departments of Medicine and Pathology, Durham, North Carolina
6. Duke Human Vaccine Institute, Duke University School of Medicine, Durham, North Carolina