- Address correspondence and reprint requests to Yang Jiaxin, MD, Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, no. 1 Shuaifuyuan, Wangfujing, Dong Cheng District, Beijing 100730, China. E-mail: .
- Received June 15, 2016
- Accepted September 14, 2016
- First published February 1, 2017.
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