1. Department of Veterans Affairs; VA Center for Clinical Management and Research; Ann Arbor VA Healthcare System; Ann Arbor Michigan USA
2. Robert Wood Johnson Clinical Scholars Program; University of Michigan; Ann Arbor Michigan USA
3. Department of Neurology; University of Michigan; Ann Arbor Michigan USA
4. Department of Radiology; University of Michigan; Ann Arbor Michigan USA
5. Department of Neurology; School of Public Health; University of Michigan; Ann Arbor Michigan USA
6. Department of Epidemiology; School of Public Health; University of Michigan; Ann Arbor Michigan USA