1. Informatics, Decision-Enhancement and Analytic Sciences Center, VA Salt Lake City Health Care System, 500 Foothill Drive Bldg. 182, Salt Lake City, UT 84148
2. Division of Epidemiology, University of Utah, 383 Colorow Dr, Suite203, Salt Lake City, UT 84108
3. Department of Neurology, University of Pittsburgh, 3471 Fifth Avenue, Pittsburgh, PA 15213
4. Department of Neurology, VA Pittsburgh Health Care System, 4100 Allequippa St, Pittsburgh, PA 15213
5. VA Neurology Service, VA Connecticut Health Care System, 950 Campbell Avenue, West Haven, CT 06516
6. Department of Epidemiology, Human Genetics and Environmental Sciences, The University of Texas Health Science Center at Houston, School of Public Health in San Antonio, 7411 John Smith Dr #1100, San Antonio, TX 78229