Where Have All the Young Men Gone? Using Gender Ratios to Measure Fetal Death Rates
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Fetal health is an important consideration in the formation of health-based policy. However, a complete census of true fetal deaths is impossible to obtain. We present the gender ratio of live births as an under-exploited metric of fetal health and apply it to examine the effects of air quality on
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美国国家经济研究局创建时间：
2011-09-01
