1. From the Departments of Ophthalmology and2Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland; the3Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland; and the Departments of
2. From the Departments of Ophthalmology and
3. Immunology and Microbiology,
4. Immunology and Microbiology,5Medicine, and6Ophthalmology, Wayne State University, Detroit, Michigan.