1. Institute of Human Virology and Division of Infectious Diseases, University of Maryland, School of Medicine, Baltimore, MD, USA
2. University of Maryland School of Medicine Department of Epidemiology and Public Health, Baltimore, MD, USA
3. University of West Florida, Department of Public Health, Clinical and Health Sciences, University of West Florida, Pensacola, FL, USA
4. Department of Epidemiology, Geisel School of Medicine at Dartmouth, Lebanon, NH, USA
5. Institute of Human Virology, University of Maryland School of Medicine, Kigali, Rwanda
6. Rwanda Biomedical Center, Institute of HIV Disease Prevention and Control, Kigali, Rwanda
7. US Centers for Disease Control and Prevention, Kigali, Rwanda