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Source:
Science News. 6/10/89, Vol. 135 Issue 23, p366-366. 1/4p.
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Source:
American Journal of Public Health. Nov89, Vol. 79 Issue 11, p1490-1493. 4p.
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Source:
American Journal of Public Health. Jun89, Vol. 79 Issue 6, p744-750. 7p.
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