General Articles And News
EpidemiologyBr Med J 1963; 2 doi: https://doi.org/10.1136/bmj.2.5351.259 (Published 27 July 1963) Cite this as: Br Med J 1963;2:259
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