Funding for this research was provided by:
National Key Research and Development Program of China (2016YFC1000703)
National Natural Science Foundation of China (81300532)
Zhejiang Provincial Natural Science Foundation of China (LQ17H040001)
Medical Scientific Research Foundation of Zhejiang Province (2016KYA120)
Received: 6 June 2018
Accepted: 10 December 2018
First Online: 3 January 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Women’s Hospital, School of Medicine, Zhejiang University.
: The manuscript does not contain any individual person’s data
: The authors declare that they have no competing interests.
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