| Literature DB >> 329694 |
W A Ray, C F Federspiel, W Schaffner.
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Year: 1977 PMID: 329694 PMCID: PMC1653786 DOI: 10.2105/ajph.67.8.762
Source DB: PubMed Journal: Am J Public Health ISSN: 0090-0036 Impact factor: 9.308