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Corresponding Author
Department of Maternal and Child Health, School of Public Health, Peking University, Beijing, 100191 China
National Health Commission Key Laboratory of Reproductive Health, Beijing, 100191 China
Correspondence
Yuan Wei, Department of Obstetrics and Gynecology, Peking University Third Hospital, 49 North Garden Rd., Haidian District, Beijing, China;
Email: weiyuanbysy@163.com; +86–010–82267852;
Xiaoli Wang, Department of Maternal and Child Health, School of Public Health, Peking University, 38 Xueyuan Rd., Haidian District, Beijing, China;
Email: xlwang@bjmu.edu.cn; +86–010–82801173
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