Medical Practice
Medicine and Books
Br Med J (Clin Res Ed) 1987; 295 doi: https://doi.org/10.1136/bmj.295.6593.325 (Published 01 August 1987) Cite this as: Br Med J (Clin Res Ed) 1987;295:325This is a PDF-only article. The first page of the PDF of this article appears above.