1. Physical Medicine and Rehabilitation Program Office, Department of Veterans Affairs (VA), Washington, DC;
2. Center for Chronic Disease Outcomes Research, Minneapolis VA Health Care System, Minneapolis, MN;
3. Department of Physical Medicine and Rehabilitation, Virginia Commonwealth University, Richmond, VA;
4. Physical Medicine and Rehabilitation Program Office, Department of Veterans Affairs (VA), Washington, DC;Rehabilitation and Prosthetics Services, Lebanon VAMC, Lebanon, PA;
5. Physical Medicine and Rehabilitation Program Office, Department of Veterans Affairs (VA), Washington, DC;Department of Physical Medicine and Rehabilitation, Washington VAMC, Washington, DC; and Department of Physical Medicine and Rehabilitation, Georgetown University Medical Center, Washington, DC