| Literature DB >> 5692059 |
S P Ramfjord, R D Emslie, J C Greene, A J Held, J Waerhaug.
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Year: 1968 PMID: 5692059 PMCID: PMC1228879 DOI: 10.2105/ajph.58.9.1713
Source DB: PubMed Journal: Am J Public Health Nations Health ISSN: 0002-9572