1. Dept. of Civil, Environmental and Geodetic Engineering, Dept. of Physical Medicine Rehabilitation, Ohio State Univ., 470 Hitchcock Hall, 2070 Neil Ave., Columbus, OH 43210 (corresponding author).
2. Dept. of Civil, Environmental and Geodetic Engineering, Electrical and Computer Engineering, Biomedical Engineering, Neurology, and Neuroscience, Ohio State Univ., 470 Hitchcock Hall, 2070 Neil Ave., Columbus, OH 43210.