Research Article
Semiologia.
British Medical Journal 1991; 302 doi: https://doi.org/10.1136/bmj.302.6777.645 (Published 16 March 1991) Cite this as: British Medical Journal 1991;302:645
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.