Br Med J. 1975 Jul 26;3(5977):208. doi: 10.1136/bmj.3.5977.208.
British medical journal
B M Frier, J B McConnell
PMID: 807291 PMCID: PMC1674087 DOI: 10.1136/bmj.3.5977.208 Free PMC Article
[No abstract available.]