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Au DH, Bryson CL, Chien JW, Sun H, Udris EM, Evans LE, Bradley KA.Au DH, et al. Among authors: bryson cl.J Gen Intern Med. 2009 Apr;24(4):457-63. doi: 10.1007/s11606-009-0907-y. Epub 2009 Feb 5.J Gen Intern Med. 2009.PMID: 19194768Free PMC article.