- Address correspondence and reprint requests to Xingsheng Yang, MD, PhD, Department of Obstetrics and Gynecology, Qilu Hospital, Shandong University, 107 Wenhuaxi Rd, Jinan 250012, People’s Republic of China. E-mail: .
- Received July 20, 2015
- Accepted January 18, 2016
- First published June 1, 2016.
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