Br Med J (Clin Res Ed) 1987; 294 doi: (Published 06 June 1987) Cite this as: Br Med J (Clin Res Ed) 1987;294:1494

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 2009 to November 2015

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Dec 2009001
Dec 2010002
Mar 2011001
May 2011001
Feb 2012001
Feb 2013001
Mar 2013001
Jul 2014004
Nov 2015002