LETTERS AND ANSWERSBr Med J 1942; 1 doi: http://dx.doi.org/10.1136/bmj.1.4242.542 (Published 25 April 1942) Cite this as: Br Med J 1942;1:542
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