1. Clinical Monitoring Research Program Directorate, Clinical Research Directorate, Frederick National Laboratory for Cancer Research sponsored by the National Cancer Institute, Frederick, Maryland, USA
2. Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health (NIH), Bethesda, Maryland, USA
3. Rakai Health Sciences Program, Kalisizo, Uganda
4. Bloomberg School of Public Health, Baltimore, Maryland, USA
5. School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
6. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
7. Division of Intramural Research, NIAID, NIH, Bethesda, Maryland, USA
8. Makerere University, School of Public Health, Kampala, Uganda