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Br Med J 1957; 2 doi: https://doi.org/10.1136/bmj.2.5040.365 (Published 10 August 1957) Cite this as: Br Med J 1957;2:365
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.