Papers And Short Reports
Unreviewed Reports
Br Med J (Clin Res Ed) 1985; 291 doi: https://doi.org/10.1136/bmj.291.6494.516 (Published 24 August 1985) Cite this as: Br Med J (Clin Res Ed) 1985;291:516This is a PDF-only article. The first page of the PDF of this article appears above.