Self-Selection, Prenatal Care, and Birthweight Among Blacks, Whites and Hispanics in New York City
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Most research on birth outcomes has found a direct relationship between appropriate prenatal care and increased birthweight. Researchers concede, however, that without a randomized design, which is clearly unethical, one cannot determine how much of the association is due to the medical intervention
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美国国家经济研究局创建时间：
1990-12-01
