- Correspondence to Professor Li-Qian Qiu, Department of Women's Health, Women's Hospital School of Medicine Zhejiang University, No. 1 Xueshi Road, Hangzhou, Zhejiang 310006, People's Republic of China;
- Received September 12, 2015
- Revised February 9, 2016
- Accepted March 5, 2016
- First published April 18, 2016.
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