| Literature DB >> 5640315 |
M Goldfield, B F Taylor, J N Welsh, R Altman, H C Black, S R Mazzur, J S Bill.
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Year: 1968 PMID: 5640315 DOI: 10.1093/oxfordjournals.aje.a120809
Source DB: PubMed Journal: Am J Epidemiol ISSN: 0002-9262 Impact factor: 4.897