Funding for this research was provided by:
the Technology Innovation Project of Science and Technology Bureau of Chengdu (2018-YF05-00247-SN)
the Scientific Research Project of Sichuan Medical Association (S17060)
the Science and Technology Innovation Fund of Sichuan Provincial Hospital for Women and Children (20180205)
Received: 12 March 2020
Accepted: 27 August 2020
First Online: 5 September 2020
Ethics approval and consent to participate
: Approval was obtained from the Medical Ethics Committee of Sichuan Provincial Hospital for Woman and Children. The procedures used in this study adhere to the tenets of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no conflict of interest.