ReviewsBr Med J 1934; 2 doi: https://doi.org/10.1136/bmj.2.3852.812 (Published 03 November 1934) Cite this as: Br Med J 1934;2:812
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