Intended for healthcare professionals

Medical Practice

Medicine and the Media

Br Med J (Clin Res Ed) 1986; 293 doi: https://doi.org/10.1136/bmj.293.6550.811 (Published 27 September 1986) Cite this as: Br Med J (Clin Res Ed) 1986;293:811
PDF extract preview

This is a PDF-only article. The first page of the PDF of this article appears above.

Log in

Log in through your institution

Subscribe

* For online subscription