Correspondence
National Epidemiology
Br Med J 1961; 1 doi: https://doi.org/10.1136/bmj.1.5237.1464-a (Published 20 May 1961) Cite this as: Br Med J 1961;1:1464Article usage
Article metrics provide readers and authors with an indication of how often a specific article has been accessed month by month. It counts three formats - abstract/extract, full text and pdf. The page is updated each day.