Supplement

The Week

Br Med J (Clin Res Ed) 1983; 287 doi: https://doi.org/10.1136/bmj.287.6397.993 (Published 01 October 1983) Cite this as: Br Med J (Clin Res Ed) 1983;287:993

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