1. Department of Social Welfare, Luskin School of Public Affairs, University of California, Los Angeles, Los Angeles, California, USA.
2. Hubert Department of Global Health, Emory University Rollins School of Public Health, Atlanta, Georgia, USA.
3. Department of Epidemiology, Emory University Rollins School of Public Health, Atlanta, Georgia, USA.
4. Emory Vaccine Center, Emory University, Atlanta, Georgia, USA.
5. Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles, Los Angeles, California, USA.
6. Department of Family Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California, USA.