1. Centers for Disease Control and Prevention (CDC), Atlanta, CDC Foundation Research Collaboration, Atlanta, Georgia
2. Vanderbilt University School of Medicine, Nashville, Tennessee
3. Boston University Schools of Public Health and Medicine, Boston, Massachusetts
4. Centers for Disease Control and Prevention (CDC), Atlanta
5. Johns Hopkins University School of Medicine, Baltimore, Maryland
6. Duke University School of Medicine, Durham, Family Health International 360, Durham, North Carolina, USA