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Boyd M, Woodward M, Lambert A.Boyd M, et al.Ann R Coll Surg Engl. 2010 Jul;92(5):W55-6. doi: 10.1308/147870810X12699662980673. Epub 2010 Jun 7.Ann R Coll Surg Engl. 2010.PMID: 20529516Free PMC article.