ANNOTATIONSBr Med J 1951; 2 doi: https://doi.org/10.1136/bmj.2.4746.1511 (Published 22 December 1951) Cite this as: Br Med J 1951;2:1511
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