[1] Ohio State Univ, Coll Optometry, 338 W 10th Ave, Columbus, OH 43210 USA
[2] Marshall B Ketchum Univ, Southern Calif Coll Optometry, Fullerton, CA USA
[3] Univ Alabama Birmingham, Sch Optometry, Birmingham, AL 35294 USA
[4] Univ Houston, Coll Optometry, Houston, TX USA
[5] Univ Arizona, Dept Ophthalmol & Vis Sci, Tucson, AZ USA