1. Hubert Department of Global Health, Emory University Rollins School of Public Health, Atlanta, GA, USA
2. Department of Epidemiology, George Washington University School of Public Health and Health Sciences, Washington, DC, USA
3. Department of Public Health and Community Medicine, Tufts University School of Medicine, Boston, MA, USA
4. Department of Epidemiology, Emory University Rollins School of Public Health, Atlanta, GA, USA
5. Emory Vaccine Center, Emory University, Atlanta, GA, USA