1. Francis I. Proctor Foundation, University of California , San Francisco, California , USA
2. School of Medicine, University of California , San Francisco, California , USA
3. The Carter Center Ethiopia , Addis Ababa , Ethiopia
4. International Trachoma Initiative, The Taskforce for Global Health , Addis Ababa , Ethiopia
5. The Carter Center , Atlanta, Georgia , USA
6. Department of Ophthalmology, University of California , San Francisco, California , USA
7. Department of Epidemiology & Biostatistics, University of California , San Francisco, California , USA
8. Institute for Global Health Sciences, University of California , San Francisco, California , USA