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BMJ. 1998 Feb 7;316(7129):463-6.
Entwistle VA, Renfrew MJ, Yearley S, Forrester J, Lamont T.
NHS Centre for Reviews and Dissemination, University of York. vael@york.ac.uk
PMID: 9492683 [PubMed - indexed for MEDLINE]PMCID: PMC2665609Free PMC Article
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