1. Center of Excellence in Amputation, Prosthetics and Limb Loss Prevention, Rehabilitation, Research and Development, Seattle, Washington
2. Seattle Epidemiologic Research and Information Center, Veterans Affairs Puget Sound Health Care System, Seattle, Washington
3. Department of Health Services, University of Washington, Seattle, Washington
4. Department of Epidemiology, University of Washington, Seattle, Washington
5. Department of Rehabilitation Medicine, University of Washington, Seattle, Washington
6. Department of Orthopedic Surgery, University of Washington, Seattle, Washington