Correspondence
Use of English
Br Med J 1971; 4 doi: https://doi.org/10.1136/bmj.4.5785.493-c (Published 20 November 1971) Cite this as: Br Med J 1971;4:493
Article 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.