- Address correspondence and reprint requests to Lihui Wei, MD, Department of Obstetrics and Gynecology, Peking University People’s Hospital, No.11 Xizhimen South St, Xicheng District, Beijing, 100044, China. Email: ; .
- Received November 22, 2015
- Accepted March 4, 2016
- First published July 1, 2016.
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