Br Med J. 1974 Jul 13;3(5923):115-6. doi: 10.1136/bmj.3.5923.115-b.
British medical journal
E C Grant
PMID: 4852734 PMCID: PMC1611052 DOI: 10.1136/bmj.3.5923.115-b Free PMC Article
[No abstract available.]