1. Department of Neurological Surgery; University of Washington School of Medicine; Seattle WA 98195-6470
2. Department of Neurology; University of Washington School of Medicine; Seattle WA 98195-6465
3. Current Affiliation-Department of Medicine; University of Washington School of Medicine; Seattle WA 98195-6420
4. Department of Pathology; University of Washington School of Medicine; Seattle WA 98195-7470