- Address correspondence and reprint requests to Jianliu Wang, MD, PhD, Department of Obstetrics and Gynecology, Peking University People's Hospital, No. 11 Xizhimen South St, Xicheng District, Beijing, China. E-mail: .
- Received June 30, 2016
- Accepted September 19, 2016
- First published January 1, 2016.
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