[1] UNIV CALIF SAN FRANCISCO, SCH MED, DEPT OPHTHALMOL, SAN FRANCISCO, CA 94143 USA
[2] UNIV CALIF SAN FRANCISCO, SCH MED, DEPT NEUROL, SAN FRANCISCO, CA 94143 USA
[3] UNIV CALIF SAN FRANCISCO, SCH MED, DEPT NEUROL SURG, NEUROOPHTHALMOL UNIT, SAN FRANCISCO, CA 94143 USA
[4] UNIV ARKANSAS MED SCI HOSP, DEPT OPHTHALMOL, LITTLE ROCK, AR 72205 USA