| Literature DB >> 3109637 |
A Shah, T Roberts, I N McQueen, J G Graham, K Walker.
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Year: 1987 PMID: 3109637 PMCID: PMC1246487 DOI: 10.1136/bmj.294.6583.1323
Source DB: PubMed Journal: Br Med J (Clin Res Ed) ISSN: 0267-0623