Vital StatisticsBr Med J 1951; 2 doi: https://doi.org/10.1136/bmj.2.4741.1228 (Published 17 November 1951) Cite this as: Br Med J 1951;2:1228
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