| Literature DB >> 3122917 |
M J Ward1, P A Routledge, A Hutchings, J M Morris.
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Year: 1988 PMID: 3122917 PMCID: PMC2544648 DOI: 10.1136/bmj.296.6614.19
Source DB: PubMed Journal: Br Med J (Clin Res Ed) ISSN: 0267-0623