British Medical Association: One Hundred and Forty-first Annual Meeting of the British Medical Association held Jointly with the One Hundred and Sixth Annual Meeting of the Canadian Medical AssociationBr Med J 1973; 3 doi: https://doi.org/10.1136/bmj.3.5870.30 (Published 07 July 1973) Cite this as: Br Med J 1973;3:30
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