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Br Med J (Clin Res Ed) 1986; 292 doi: https://doi.org/10.1136/bmj.292.6525.965 (Published 05 April 1986) Cite this as: Br Med J (Clin Res Ed) 1986;292:965This is a PDF-only article. The first page of the PDF of this article appears above.
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