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Br Med J (Clin Res Ed) 1985; 291 doi: https://doi.org/10.1136/bmj.291.6503.1198 (Published 26 October 1985) Cite this as: Br Med J (Clin Res Ed) 1985;291:1198This is a PDF-only article. The first page of the PDF of this article appears above.