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Deyo RA, Smith DH, Johnson ES, Donovan M, Tillotson CJ, Yang X, Petrik AF, Dobscha SK.Deyo RA, et al.J Am Board Fam Med. 2011 Nov-Dec;24(6):717-27. doi: 10.3122/jabfm.2011.06.100232.J Am Board Fam Med. 2011.PMID: 22086815Free PMC article.