Funding for this research was provided by:
Shanghai Municipal Population and Family Planning Commission (201840116)
Received: 18 April 2020
Accepted: 7 July 2020
First Online: 11 July 2020
Ethics approval and consent to participate
: The study was approved by Ethics Committee of Zhongshan Hospital Fudan University(B2018-202R). Written Informed consent was obtained from all the patients.
: Not applicable.
: The authors declare that they have no competing interests.