1. From the Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina;
2. Department of Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, Ohio;
3. Department of Ophthalmology, Emory University, Atlanta, Georgia; the
4. Emmes Corporation, Rockville, Maryland; the
5. National Eye Institute, National Institutes of Health, Bethesda, Maryland; and the
6. Pharmacy Department and
7. Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland.