1. Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA
2. Department of Public Health & Community Medicine, Tufts University School of Medicine, Boston, MA 02111, USA
3. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA
4. Emory Vaccine Center, Emory University, Atlanta, GA 30317, USA
5. Department of Civil and Environmental Engineering, Tufts University School of Engineering, Medford, MA 02155, USA