| Literature DB >> 4986106 |
L L Kulczycki, H Shwachman, E Langer, H Provost, B S Ferguson, P Good.
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Year: 1970 PMID: 4986106 PMCID: PMC1348905 DOI: 10.2105/ajph.60.5.880
Source DB: PubMed Journal: Am J Public Health Nations Health ISSN: 0002-9572