British Medical JournalBr Med J 1921; 2 doi: https://doi.org/10.1136/bmj.2.3181.1047 (Published 17 December 1921) Cite this as: Br Med J 1921;2:1047
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