Br Med J (Clin Res Ed) 1984; 288 doi: https://doi.org/10.1136/bmj.288.6433.1835 (Published 16 June 1984) Cite this as: Br Med J (Clin Res Ed) 1984;288:1835

Article usage

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Usage statistics: December 2010 to March 2016

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Dec 201002
Mar 201101
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Feb 201201
Feb 201302
May 201301
Sep 201306
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Dec 201502
Mar 201601