Department of Medical PhotographyBr Med J 1948; 1 doi: http://dx.doi.org/10.1136/bmj.1.4552.664-a (Published 03 April 1948) Cite this as: Br Med J 1948;1:664
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