Funding for this research was provided by:
Public Welfare Technology Research Program of Zhejiang Province (LGC20H200003)
National Key Research and Development Plan (2018YFC1002702)
Received: 8 December 2019
Accepted: 7 February 2020
First Online: 4 March 2020
Ethics approval and consent to participate
: The study was approved by the Hospital Ethics Committee of the Women’s Hospital School of Medicine, Zhejiang University. Each patient signed informed consent prior to study enrollment.
: Not applicable.
: The author(s) declare that they have no competing interest.