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Br Med J (Clin Res Ed) 1984; 289 doi: https://doi.org/10.1136/bmj.289.6455.1388 (Published 17 November 1984) Cite this as: Br Med J (Clin Res Ed) 1984;289:1388This is a PDF-only article. The first page of the PDF of this article appears above.
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