Medicine and BooksBr Med J (Clin Res Ed) 1981; 282 doi: https://doi.org/10.1136/bmj.282.6260.301 (Published 24 January 1981) Cite this as: Br Med J (Clin Res Ed) 1981;282:301
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