1. Department of Ophthalmology, Penn State College of Medicine, Hershey, Pennsylvania2Department of Public Health Sciences, Penn State College of Medicine, Hershey, Pennsylvania
2. The Emmes Corporation, Rockville, Maryland
3. Doheny Eye Institute, University of California, Los Angeles
4. University of Wisconsin Fundus Photograph Reading Center, Madison
5. Tennessee Retina, PC, Nashville
6. Retinal Consultants of Arizona, Phoenix
7. Southeast Retina Center, PC, Augusta, Georgia
8. Cumberland Valley Retina Consultants, Hagerstown, Maryland