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Cook DA, Dupras DM, Beckman TJ, Thomas KG, Pankratz VS.Cook DA, et al. Among authors: beckman tj.J Gen Intern Med. 2009 Jan;24(1):74-9. doi: 10.1007/s11606-008-0842-3. Epub 2008 Nov 11.J Gen Intern Med. 2009.PMID: 19002533Free PMC article.Clinical Trial.