[1] Penn Coll Optometry, Inst Eye, Philadelphia, PA 19141 USA
[2] Ohio State Univ, Optometry Coordinating Ctr, Columbus, OH 43210 USA
[3] Ohio State Univ, Coll Optometry, Columbus, OH 43210 USA
[4] So Calif Coll Optometry, Fullerton, CA USA
[5] SUNY Coll Optometry, New York, NY 10010 USA
[6] Pacific Univ, Coll Optometry, Forest Grove, OR USA
[7] Univ Houston, Coll Optometry, Houston, TX USA