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Your query returned 3 studies.

1.
National Health Interview Survey, 1985: Health Promotion and Disease Prevention (HPDP) Smoking History During Pregnancy Supplement (ICPSR 9764)
United States Department of Health and Human Services. National Center for Health Statistics
2.
National Health Interview Survey, 1990: Health Promotion and Disease Prevention (HPDP) Pregnancy and Smoking Supplement (ICPSR 9912)
United States Department of Health and Human Services. Centers for Disease Control and Prevention. National Center for Health Statistics
3.
National Health Interview Survey, 1991: Pregnancy and Smoking Supplement (ICPSR 6138)
United States Department of Health and Human Services. Centers for Disease Control and Prevention. National Center for Health Statistics

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