?:authorAffiliation
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[\'Department of Maternal and Child Health, School of Public Health, Peking University, Beijing, China.\', \'Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing, China; National Health Commission Key Laboratory of Reproductive Health, Beijing, China.\', \'Department of Maternal and Child Health, School of Public Health, Peking University, Beijing, China; National Health Commission Key Laboratory of Reproductive Health, Beijing, China. Electronic address: xlwang@bjmu.edu.cn.\']
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