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Br Med J (Clin Res Ed) 1987; 294 doi: https://doi.org/10.1136/bmj.294.6586.1546 (Published 13 June 1987) Cite this as: Br Med J (Clin Res Ed) 1987;294:1546This is a PDF-only article. The first page of the PDF of this article appears above.