Research Article
Where's the block?
Br Med J (Clin Res Ed) 1984; 288 doi: https://doi.org/10.1136/bmj.288.6419.737 (Published 10 March 1984) Cite this as: Br Med J (Clin Res Ed) 1984;288:737This is a PDF-only article. The first page of the PDF of this article appears above.