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Source:
American Journal of Public Health. Oct90, Vol. 80 Issue 10, p1230-1235. 6p. 4 Charts.
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Source:
American Journal of Public Health. Apr90, Vol. 80 Issue 4, p423-427. 5p.
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Source:
American Journal of Public Health. Jul99, Vol. 89 Issue 7, p993-995. 3p.
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