1. Rollins School of Public Health, Emory University , Atlanta , GA, USA
2. Trachoma Control Program, The Carter Center , Atlanta , GA, USA
3. Trachoma Control Program, The Carter Center , Addis Ababa , Ethiopia
4. Research and Technology Transfer Directorate, Amhara Public Health Institute , Bahir Dar , Ethiopia
5. Department of Ophthalmology, University of Gondar , Gondar , Ethiopia
6. Francis I. Proctor Foundation, University of California , San Francisco , San Francisco, CA, USA