1. Center for Clinical Epidemiology and Biostatistics and
2. Center of Innovation on Disability and Rehabilitation Research, Malcom Randall Department of Veterans Affairs Medical Center (VAMC), Gainesville, FL; and Department of Health Outcomes and Policy, University of Florida, Gainesville, FL;
3. Center of Innovation on Disability and Rehabilitation Research, Rehabilitation Outcomes Research Center of Excellence, Malcom Randall VAMC, Gainesville, FL; and Department of Health Outcomes and Policy, College of Medicine, University of Florida, Gainesville, FL;
4. Albany VAMC, Albany, NY; and Department of Physical Medicine and Rehabilitation, Albany Medical College, Albany, NY