Research Article
Licensed to kill.
Br Med J (Clin Res Ed) 1986; 293 doi: https://doi.org/10.1136/bmj.293.6552.904 (Published 11 October 1986) Cite this as: Br Med J (Clin Res Ed) 1986;293:904
This is a PDF-only article. The first page of the PDF of this article appears above.