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Ancker JS, Barrón Y, Rockoff ML, Hauser D, Pichardo M, Szerencsy A, Calman N.Ancker JS, et al.J Gen Intern Med. 2011 Oct;26(10):1117-23. doi: 10.1007/s11606-011-1749-y. Epub 2011 Jun 7.J Gen Intern Med. 2011.PMID: 21647748Free PMC article.