Maternal Smoking and the Timing of WIC Enrollment
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We investigate the association between the timing of enrollment in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) and smoking among prenatal WIC participants. We use WIC data from eight states participating in the Pregnancy Nutrition Surveillance System (PNSS).
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美国国家经济研究局创建时间：
2009-02-01
