Intended for healthcare professionals

Medical Practice

Medicine and Books

Br Med J (Clin Res Ed) 1987; 294 doi: https://doi.org/10.1136/bmj.294.6564.111 (Published 10 January 1987) Cite this as: Br Med J (Clin Res Ed) 1987;294:111
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