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Curtis JR, McClure LA, Delzell E, Howard VJ, Orwoll E, Saag KG, Safford M, Howard G.Curtis JR, et al.J Gen Intern Med. 2009 Aug;24(8):956-62. doi: 10.1007/s11606-009-1031-8. Epub 2009 Jun 24.J Gen Intern Med. 2009.PMID: 19551449Free PMC article.