| Literature DB >> 5692055 |
I T Higgins, J C Gilson, B G Ferris, M E Waters, H Campbell, M W Higgins.
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Year: 1968 PMID: 5692055 PMCID: PMC1228875 DOI: 10.2105/ajph.58.9.1667
Source DB: PubMed Journal: Am J Public Health Nations Health ISSN: 0002-9572