1. Bill & Melinda Gates Foundation, London, United Kingdom
2. Center for Immunization Research, Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
3. Diarrheal Disease Research, Bacterial Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland, USA
4. School of Public Health, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
5. University of Nevada, Reno School of Medicine, Reno, Nevada, USA
6. World Health Organization, Geneva, Switzerland