1. Research and Surveillance Division, DoD-VA Extremity Trauma and Amputation Center of Excellence (EACE) , San Diego, CA 92134, USA
2. Department of Physical and Occupational Therapy, Naval Medical Center San Diego , San Diego, CA 92134, USA
3. Doctor of Physical Therapy Program, DeBusk College of Osteopathic Medicine, Lincoln Memorial University , Knoxville, TN 37932, USA
4. Center for Limb Loss and Mobility (CLiMB), VA Puget Sound, Center for Limb Loss and MoBility (CLiMB) , Seattle, WA 98108, USA
5. Department of Mechanical Engineering, University of Washington , Seattle, WA 98195, USA
6. Department of Physical Medicine and Rehabilitation, Uniformed Services University of Health Sciences , Bethesda, MD 20814, USA
7. Department of Orthopaedic Surgery, University of Pittsburgh , Pittsburgh, PA 15213, USA