Articles

Minerva

BMJ 1992; 304 doi: https://doi.org/10.1136/bmj.304.6836.1256 (Published 09 May 1992) Cite this as: BMJ 1992;304:1256

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

PDF extract preview

Sign in

Log in through your institution

Subscribe