| Literature DB >> 843835 |
L L Cederqvist, I A Zervoudakis, L C Ewool, L B Senterfit, S D Litwin.
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Year: 1977 PMID: 843835 PMCID: PMC1605309 DOI: 10.1136/bmj.1.6061.615
Source DB: PubMed Journal: Br Med J ISSN: 0007-1447