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Br Med J (Clin Res Ed) 1981; 283 doi: https://doi.org/10.1136/bmj.283.6295.865 (Published 26 September 1981) Cite this as: Br Med J (Clin Res Ed) 1981;283:865

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Usage statistics: March 2021 to July 2023

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Feb 2021001
Sep 2021001
Jun 2022001
Jul 2023001
Total004