NEWS AND NOTESBr Med J (Clin Res Ed) 1984; 288 doi: https://doi.org/10.1136/bmj.288.6418.726 (Published 03 March 1984) Cite this as: Br Med J (Clin Res Ed) 1984;288:726
Log in using your username and password
Log in through your institution
Register for a free trial to thebmj.com to receive unlimited access to all content on thebmj.com for 14 days.
Sign up for a free trial