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Van Dillen LR, Sahrmann SA, Norton BJ, Caldwell CA, McDonnell MK, Bloom N.Van Dillen LR, et al.Arch Phys Med Rehabil. 2003 Mar;84(3):313-22. doi: 10.1053/apmr.2003.50010.Arch Phys Med Rehabil. 2003.PMID: 12638097Clinical Trial.