Research Article
Society of Authors and its Medical Writers Group.
Br Med J (Clin Res Ed) 1985; 290 doi: https://doi.org/10.1136/bmj.290.6477.1256 (Published 27 April 1985) Cite this as: Br Med J (Clin Res Ed) 1985;290:1256This is a PDF-only article. The first page of the PDF of this article appears above.