Funding for this research was provided by:
National Natural Science Foundation of China (81300532)
National Key Research and Development Program of China (2016YFC1000703)
Zhejiang Provincial Natural Science Foundation of China (LQ17H040001)
Medical Scientific Research Foundation of Zhejiang Province (2016KYA120)
Received: 21 July 2017
Accepted: 22 January 2018
First Online: 30 January 2018
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Women’s Hospital, School of Medicine, Zhejiang University. Written informed consent was obtained from all participants.
: Not applicable
: The authors declare that they have no competing interests.
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