Hepatitis B Does Not Explain Male-Biased Sex Ratios in China
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Earlier work (Oster, 2005) has argued, based on existing medical literature and analysis of cross country data and vaccination programs, that parents who are carriers of hepatitis B have a higher offspring sex ratio (more boys) than non-carrier parents. Further, since a number of Asian countries,
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美国国家经济研究局创建时间：
2008-05-01
