1. Center for Chronic Disease Outcomes Research, Department of Veterans Affairs Health Care System, Minneapolis, Minnesota.
2. Department of Medicine, University of Minnesota, Minneapolis, Minnesota.
3. Division of Epidemiology and Community Health, University of Minnesota, Minneapolis, Minnesota.
4. Physical Medicine and Rehabilitation Services, Veterans Health Administration, VA Medical Center, Lebanon, Pennsylvania.
5. Physical Medicine and Rehabilitation Program Office, Department of Veterans Affairs, Washington, DC.
6. Department of Physical Medicine and Rehabilitation, Washington DC VA Medical Center, Washington, DC.
7. Center of Innovation for Complex Chronic Healthcare, Hines VA Hospital, Hines, Illinois.
8. Department of Public Health Sciences, Loyola University Chicago, Maywood, Illinois.
9. Department of Psychiatry, University of Minnesota, Minneapolis, Minnesota.