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Hidler, Joseph; Brennan, David; Black, Iian; Nichols, Diane; Brady, Kathy; Nef, Tobias (2011). ZeroG: overground gait and balance training system. Journal of rehabilitation research and development, 48(4), pp. 287-98. Washington, D.C.: U.S. Dept. of Veterans Affairs 10.1682/JRRD.2010.05.0098
