Papers And Short Reports
Unreviewed Reports
Br Med J (Clin Res Ed) 1984; 288 doi: https://doi.org/10.1136/bmj.288.6434.1880 (Published 23 June 1984) Cite this as: Br Med J (Clin Res Ed) 1984;288:1880This is a PDF-only article. The first page of the PDF of this article appears above.