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British Medical Journal 1992; 305 doi: https://doi.org/10.1136/bmj.305.6854.631 (Published 12 September 1992) Cite this as: British Medical Journal 1992;305:631

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: May 2018 to May 2024

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