NEWS AND NOTESBr Med J 1973; 2 doi: https://doi.org/10.1136/bmj.2.5860.252 (Published 28 April 1973) Cite this as: Br Med J 1973;2:252
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