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Br Med J (Clin Res Ed) 1983; 287 doi: https://doi.org/10.1136/bmj.287.6398.1063 (Published 08 October 1983) Cite this as: Br Med J (Clin Res Ed) 1983;287:1063This is a PDF-only article. The first page of the PDF of this article appears above.