Br Med J. 1974 Nov 30;4(5943):486-7. doi: 10.1136/bmj.4.5943.486-a.
British medical journal
[No authors listed]
PMID: 4474045 PMCID: PMC1612627 DOI: 10.1136/bmj.4.5943.486-a Free PMC Article
[No abstract available.]