1. Va Salt Lake City Health Care System, Informatics, Decision-Enhancement and Analytic Sciences Center, Salt Lake City, Utah, USA
2. Division of Epidemiology, University of Utah School of Medicine, Salt Lake City, Utah, USA
3. Department of Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
4. Neurology, University of Utah School of Medicine, Salt Lake City, Utah, USA
5. Department of Neurology, Uniformed Services University of Health Sciences, Bethesda, Maryland, USA
6. John Hopkins, School of Nursing and Medicine, Baltimore, Maryland, USA
7. Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
8. VA Pittsburgh Health Care System, Pittsburgh Pennsylvania, USA