- Address correspondence and reprint requests to Kang Shan, PhD, Department of Obstetrics and Gynecology, Hebei Medical University, Fourth Hospital, Jiankanglu 12, Shijiazhuang 050011, China. E-mail: .
- Received April 8, 2016
- Accepted July 24, 2016
- First published November 1, 2016.
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