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BMJ 2006; 332 doi: https://doi.org/10.1136/bmj.332.7539.476 (Published 23 February 2006) Cite this as: BMJ 2006;332:476

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.

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