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Kirby RL, Ackroyd-Stolarz SA, Brown MG, Kirkland SA, MacLeod DA.Kirby RL, et al.Am J Phys Med Rehabil. 1994 Sep-Oct;73(5):319-30. doi: 10.1097/00002060-199409000-00004.Am J Phys Med Rehabil. 1994.PMID: 7917161