1. Infections and Immunoepidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, Maryland
2. Demographic and Health Surveys, ICF International, Rockville, Maryland
3. Department of Medicine, Stanford University School of Medicine, Palo Alto, California
4. Department of Infectious Disease, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, China
5. Department of Microbiology and Immunology, Stanford University School of Medicine, Palo Alto, California
6. Information Management Services, Calverton, Maryland
7. Urban Health Study, University of California San Francisco
8. Department of Medicine, Weill Cornell Medical College, New York