Articles SUPPLEMENT Br Med J 1974; 1 doi: https://doi.org/10.1136/bmj.1.5904.15 (Published 02 March 1974) Cite this as: Br Med J 1974;1:15 Article Related content Metrics Responses Peer review Related articles Correction Corrigendum Published: 06 February 1932; Br Med J 1 doi:10.1136/bmj.1.3709.268-a