| Literature DB >> 953563 |
R F Armstrong, P A Southorn, J Secker-Walker, J C Lincoln, L Soutter.
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Year: 1976 PMID: 953563 PMCID: PMC1687952 DOI: 10.1136/bmj.2.6030.282
Source DB: PubMed Journal: Br Med J ISSN: 0007-1447