Papers And Short Reports
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Br Med J (Clin Res Ed) 1985; 290 doi: https://doi.org/10.1136/bmj.290.6479.1394 (Published 11 May 1985) Cite this as: Br Med J (Clin Res Ed) 1985;290:1394This is a PDF-only article. The first page of the PDF of this article appears above.