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Citation |
Christoffel TH, Christoffel KK. Am. J. Public Health 1989; 79(3): 336-339. |
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Affiliation |
School of Public Health, University of Illinois, Chicago 60680. |
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Copyright |
(Copyright © 1989, American Public Health Association) |
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DOI |
unavailable |
PMID |
2644852 |
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PMCID |
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Abstract |
unavailable. |