1. From the Department of Health Policy and Management, Bloomberg School of Public Health, The Johns Hopkins University, Baltimore, Maryland;
2. the Department of Ophthalmology and Visual Sciences, Washington University in St. Louis School of Medicine, St. Louis, Missouri;
3. the Duke Eye Center and
4. the Duke Global Health Institute, Duke University, Durham, North Carolina;
5. Access Economics, Canberra, Australian Capital Territory, Australia;
6. RTI International, Research Triangle Park, North Carolina; and
7. the Melbourne School of Population Health, University of Melbourne, Melbourne, Victoria, Australia.