| Literature DB >> 5636976 |
H Campbell, W J Greene, J W Keyser, W E Waters, J M Weddell, J L Withey.
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Year: 1968 PMID: 5636976 PMCID: PMC1059111 DOI: 10.1136/jech.22.1.41
Source DB: PubMed Journal: Br J Prev Soc Med ISSN: 0007-1242