Br Med J. 1974 May 25;2(5916):446-7. doi: 10.1136/bmj.2.5916.446-c.
British medical journal
J S Norrell
PMID: 4835319 PMCID: PMC1610487 DOI: 10.1136/bmj.2.5916.446-c Free PMC Article
[No abstract available.]