| Literature DB >> 3105717 |
S R Cunningham, G W Dalzell, P McGirr, M M Khan.
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Year: 1987 PMID: 3105717 PMCID: PMC1245796 DOI: 10.1136/bmj.294.6574.739-a
Source DB: PubMed Journal: Br Med J (Clin Res Ed) ISSN: 0267-0623