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Br Med J 1980; 280 doi: https://doi.org/10.1136/bmj.280.6209.260 (Published 26 January 1980) Cite this as: Br Med J 1980;280:260

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.

Usage statistics: December 2010 to December 2016

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FullPdf
Dec 201002
Mar 201101
Sep 201101
Nov 201101
Dec 201101
Feb 201201
Dec 201201
Jan 201302
Mar 201301
Jul 201301
Nov 201301
Jul 201403
Jun 201601
Dec 201601
Total018