1. School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
2. Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
3. Department of Neurology, University of Pittsburgh, Pittsburgh, Pennsylvania
4. Department of Psychiatry, University of Pittsburgh, Pittsburgh, Pennsylvania
5. Department of Radiology, University of Pittsburgh, Pittsburgh, Pennsylvania
6. now with the Department of Radiology, Massachusetts General Hospital, Boston
7. Department of Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania
8. Department of Human Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania
9. Department of Neurology, University of Florida, Gainesville