| Literature DB >> 5061698 |
S M Austin, R Altman, E K Barnes, W J Dougherty.
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Year: 1972 PMID: 5061698 DOI: 10.1093/oxfordjournals.aje.a121370
Source DB: PubMed Journal: Am J Epidemiol ISSN: 0002-9262 Impact factor: 4.897