Funding for this research was provided by:
Natural Science Foundation of Zhejiang Province (LY20H040009, LQ20H040008)
Received: 19 July 2020
Accepted: 12 October 2020
First Online: 16 October 2020
Ethics approval and consent to participate
: This paper is approved by Medical Ethics Committee of Women’s Hospital, Zhejiang University School of Medicine. Informed consent was not obtained because no patient information was published herein.
: Not applicable.
: The authors declare that they have no competing interests.