Letters
Fact sheets, posters, and protocol cards available
BMJ 1994; 308 doi: https://doi.org/10.1136/bmj.308.6921.132a (Published 08 January 1994) Cite this as: BMJ 1994;308:132
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.