| Literature DB >> 3089365 |
A P Allen, D J Tymms, B A Leatherdale, R S Lloyd.
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Year: 1986 PMID: 3089365 PMCID: PMC1340636 DOI: 10.1136/bmj.292.6537.1710-a
Source DB: PubMed Journal: Br Med J (Clin Res Ed) ISSN: 0267-0623