Letter from WestminsterBr Med J (Clin Res Ed) 1981; 282 doi: http://dx.doi.org/10.1136/bmj.282.6281.2069 (Published 20 June 1981) Cite this as: Br Med J (Clin Res Ed) 1981;282:2069
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