- Address correspondence and reprint requests to Xin Zeng, PhD, Nanjing Maternity and Child Health Medical Institute, Obstetrics and Gynecology Hospital Affiliated to Nanjing Medical University, 210004 Nanjing, China. E-mail: ; or Ping Li. E-mail: .
- Received February 8, 2017
- Accepted March 17, 2017
- First published September 1, 2017.
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