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Singh H, Petersen LA, Daci K, Collins C, Khan M, El-Serag HB.Singh H, et al.Qual Saf Health Care. 2010 Oct;19(5):e27. doi: 10.1136/qshc.2009.033712. Epub 2010 Jun 27.Qual Saf Health Care. 2010.PMID: 20584706Free PMC article.