- Address correspondence and reprint requests to Zhu Yang, Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Chongqing Medical University, 76# Linjiang Rd, Yuzhong District, Chongqing 400010, People’s Republic of China. E-mail: .
- Received March 13, 2014
- Accepted May 1, 2014
- First published September 1, 2014.
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