Br Med J. 1968 May 25;2(5603):489. doi: 10.1136/bmj.2.5603.489.
British medical journal
R J Browne, D C Sturdy
PMID: 5648300 PMCID: PMC1991897 DOI: 10.1136/bmj.2.5603.489 Free PMC Article
[No abstract available.]