British Medical JournalBr Med J 1930; 2 doi: https://doi.org/10.1136/bmj.2.3648.967 (Published 06 December 1930) Cite this as: Br Med J 1930;2:967
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