Correspondence
Abbreviations
Br Med J 1969; 1 doi: https://doi.org/10.1136/bmj.1.5636.120 (Published 11 January 1969) Cite this as: Br Med J 1969;1:120
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.