1. Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.
2. Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland 21205.
3. Department of Statistics and Institute for Health, Health Care Policy and Aging Research, Rutgers University, Piscataway, New Jersey 08854.
4. Monogram Biosciences, South San Francisco, California 94080.
5. Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599.
6. Department of Obstetrics and Gynaecology, Makerere University, Kampala, Uganda.
7. Department of Paediatrics, Makerere University, Kampala, Uganda.