| Literature DB >> 6295542 |
K J Sheppard, D A Bradbury, J M Davies, D R Ryrie.
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Year: 1983 PMID: 6295542 PMCID: PMC1546636 DOI: 10.1136/bmj.286.6358.57
Source DB: PubMed Journal: Br Med J (Clin Res Ed) ISSN: 0267-0623