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Ferguson HJ, Hall NJ, Bhangu A; National Surgical Research Collaborative.Ferguson HJ, et al.BMJ Qual Saf. 2014 Sep;23(9):732-40. doi: 10.1136/bmjqs-2013-002290. Epub 2014 Feb 7.BMJ Qual Saf. 2014.PMID: 24508682