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Singal AG, Yopp A, S Skinner C, Packer M, Lee WM, Tiro JA.Singal AG, et al.J Gen Intern Med. 2012 Jul;27(7):861-7. doi: 10.1007/s11606-011-1952-x. Epub 2012 Jan 4.J Gen Intern Med. 2012.PMID: 22215266Free PMC article.Review.