[1] Ohio State Univ, Coll Optometry, Columbus, OH 43210 USA
[2] Washington Univ, Dept Ophthalmol & Visual Sci, St Louis, MO 63130 USA
[3] Washington Univ, Div Biostat, St Louis, MO 63130 USA
[4] So Calif Coll Optometry, Fullerton, CA USA
[5] Univ Illinois, Dept Ophthalmol & Visual Sci, Chicago, IL 60680 USA
[6] NEI, Bethesda, MD 20892 USA