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Nguyen HQ, Ackermann RT, Maciejewski M, Berke E, Patrick M, Williams B, LoGerfo JP.Nguyen HQ, et al.Prev Chronic Dis. 2008 Jan;5(1):A14. Epub 2007 Dec 15.Prev Chronic Dis. 2008.PMID: 18082003Free PMC article.
Chan L, Beaver S, Maclehose RF, Jha A, Maciejewski M, Doctor JN.Chan L, et al.Arch Phys Med Rehabil. 2002 Sep;83(9):1196-201. doi: 10.1053/apmr.2002.34811.Arch Phys Med Rehabil. 2002.PMID: 12235597