Medicine and the MediaBr Med J 1980; 280 doi: http://dx.doi.org/10.1136/bmj.280.6210.320 (Published 02 February 1980) Cite this as: Br Med J 1980;280:320
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