Articles NEWS AND NOTES Br Med J (Clin Res Ed) 1986; 292 doi: https://doi.org/10.1136/bmj.292.6522.767 (Published 15 March 1986) Cite this as: Br Med J (Clin Res Ed) 1986;292:767 Article Related content Metrics Responses Peer review Related articles No related articles found.