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- [4] Department of Health and Human Services, 1980, PROM HLTH PREV DIS O
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- [8] National Center For Health Statistics, 1981, DHHS PHS PUBL, V81-1163
- [9] National Center For Health Statistics, 1979, DHHS PHS PUBL, V80-1551
- [10] National Institutes of Health, 1981, DHHS NIH PUBL, V81-2118