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Murphy DJ, Guthrie B, Sullivan FM, Mercer SW, Russell A, Bruce DA.Murphy DJ, et al. Among authors: mercer sw.BMJ Qual Saf. 2012 Aug;21(8):649-56. doi: 10.1136/bmjqs-2011-000429. Epub 2012 May 31.BMJ Qual Saf. 2012.PMID: 22653078Free PMC article.