1. Spectrum Research, Tacoma, Washington, USA
2. Department of Biostatistics, University of Washington, Seattle, Washington, USA
3. Department of Epidemiology, University of Washington, Seattle, Washington, USA
4. Division of Internal Medicine, University of Washington, Seattle, Washington, USA
5. Epidemiologic Research and Information Center, VA Puget Sound Health Care System, Seattle, Washington, USA
6. Department of Surgery, Division of Vascular Surgery, Oregon Health and Science University, Portland, Oregon, USA
7. Health Services Research and Development, VA Puget Sound Health Care System, Seattle, Washington, USA
8. Adult and Child Consortium for Outcomes Research and Delivery Science, University of Colorado, Denver, Colorado, USA
9. Department of Rehabilitation Medicine, University of Washington, Seattle, Washington, USA
10. Rehabilitation Care Services, VA Puget Sound Health Care System, Seattle, Washington, USA
11. Veterans Affairs (VA) Center for Limb Loss and Mobility (CLiMB), VA Puget Sound Health Care System, Seattle, Washington, USA