The Royal Medical SocietyBr Med J 1952; 2 doi: https://doi.org/10.1136/bmj.2.4793.1082-a (Published 15 November 1952) Cite this as: Br Med J 1952;2:1082
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