[1] UNIV MICHIGAN,SCH MED,DEPT OPHTHALMOL,ANN ARBOR,MI 48104
[2] UNIV MICHIGAN,SCH MED,DEPT NEUROL,ANN ARBOR,MI 48104
[3] UNIV MICHIGAN,SCH MED,DEPT NEUROSURG,ANN ARBOR,MI 48104
[4] WILLS EYE HOSP,NEUROOPHTHALMOL UNIT,PHILADELPHIA,PA 19107
[5] UNIV PENN,SCH MED,DEPT NEUROL,PHILADELPHIA,PA 19104
[6] UNIV PENN,SCH MED,DEPT OPHTHALMOL,PHILADELPHIA,PA 19104