Any Questions?Br Med J 1964; 2 doi: https://doi.org/10.1136/bmj.2.5406.430 (Published 15 August 1964) Cite this as: Br Med J 1964;2:430
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