1. Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia
2. Medical Research Council: Respiratory and Meningeal Pathogens Research Unit, University of the Witwatersrand, Faculty of Health Sciences Johannesburg, South Africa
3. Department of Science and Technology/National Research Foundation: Vaccine Preventable Diseases, University of the Witwatersrand, Faculty of Health Sciences, Johannesburg, South Africa
4. Emory Global Health Institute, Emory University, Atlanta, Georgia