1. From the Clinical Trials Branch, Division of Epidemiology and Clinical Research, National Eye Institute, National Institutes of Health, Bethesda, Maryland; the
2. EMMES Corporation, Rockville, Maryland; the
3. Office of the Clinical Director, National Eye Institute, National Institutes of Health, Bethesda, Maryland; the
4. Department of Chemistry and Biochemistry, Florida International University, Miami, FL; the
5. Joint Institute for Food Safety and Applied Nutrition, Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland; and the
6. Centers for Disease Control and Prevention, Atlanta, Georgia.