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Matheson EM, Player MS, Mainous AG 3rd, King DE, Everett CJ.Matheson EM, et al.J Am Board Fam Med. 2008 May-Jun;21(3):179-83. doi: 10.3122/jabfm.2008.03.070273.J Am Board Fam Med. 2008.PMID: 18467528Free article.