1. Department of Internal Medicine, Wake Forest School of Medicine, Wake Forest University, Winston-Salem, North Carolina
2. Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania
3. Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
4. Department of Psychiatry, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
5. Department of Radiology, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
6. Department of Neurology, School of Medicine, University of Virginia, Charlottesville