[1] UNIV CALIF, SCH MED, DEPT NEUROL, SAN FRANCISCO, CA 94122 USA
[2] UNIV CALIF, SCH MED, DEPT NEUROSURG, DIV NEUROOPHTHALMOL, SAN FRANCISCO, CA 94122 USA
[3] UNIV FREIBURG, AUGE KLIN, FREIBURG 78, WEST GERMANY
[4] UNIV CALIF, SCH MED, DEPT OPHTHALMOL, SAN FRANCISCO, CA 94122 USA