1. Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland
2. Jaeb Center for Health Research, Tampa, Florida
3. Fundus Photograph Reading Center, University of Wisconsin, Madison
4. California Retina Consultants and Research Foundation, Santa Barbara
5. Feinberg School of Medicine, Northwestern University, Chicago, Illinois
6. Thomas Eye Group, Atlanta, Georgia
7. Southeast Retina Center, PC, Augusta, Georgia
8. Palmetto Retina Center, Columbia, South Carolina