Institution: | 1. Department of Veterans Affairs Medical Center , Rehabilitation Research and Development Center , Palo Alto, CA, 94304–1200, U.S.A.;2. Department of Mechanical Engineering , Biomechanical Engineering Program, Stanford University , Stanford, CA, 94305–4021, U.S.A.;3. Department of Diagnostic Radiology , Division of Radiologic Physics and Engineering, Henry Ford Hospital , Detroit, MI, 48202, U.S.A. |