| Literature DB >> 589229 |
B F Clarke, I W Campbell, D M Fraser, E W Barnes, N J Douglas, I R Starkey.
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Year: 1977 PMID: 589229 PMCID: PMC1632389 DOI: 10.1136/bmj.2.6099.1395-a
Source DB: PubMed Journal: Br Med J ISSN: 0007-1447