Letters, Notes, and AnswersBr Med J 1939; 1 doi: http://dx.doi.org/10.1136/bmj.1.4089.1070 (Published 20 May 1939) Cite this as: Br Med J 1939;1:1070
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