| Literature DB >> 6812804 |
A Barr, R J Crawford, B C Dow, E A Follett, I Macvarish, R Mitchell.
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Year: 1982 PMID: 6812804 PMCID: PMC1500138 DOI: 10.1136/bmj.285.6349.1201
Source DB: PubMed Journal: Br Med J (Clin Res Ed) ISSN: 0267-0623