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Ann Intern Med. 2012 May 1;156(9):ITC5-1, ITC5-2, ITC5-3, ITC5-4, ITC5-5, ITC5-6, ITC5-7, ITC5-8, ITC5-9, ITC5-10, ITC5-11, ITC5-12, ITC5-13, ITC5-14, ITC5-15; quiz ITC5-16. doi: 10.7326/0003-4819-156-9-201205010-01005.