1. Harvard Graduate School of Education, Cambridge, Massachusetts, USA
2. RTI International, Research Triangle Park, North Carolina, USA
3. Duke University, Durham, North Carolina, USA
4. University of Virginia, Charlottesville, Virginia, USA
5. London School of Hygiene & Tropical Medicine, London, UK
6. University of Nairobi, Nairobi, Kenya
7. University of Pennsylvania, Philadelphia, Pennsylvania, USA
8. Florida State University, Tallahassee, Florida, USA