Funding for this research was provided by:
Health Science and technology project of Guangzhou (20211A011026, 20201A011029)
Received: 18 October 2021
Accepted: 8 April 2022
First Online: 15 April 2022
: The study protocol was approved by the ethics committee of the Guangzhou Women and Children’s Medical Center. All methods were carried out in accordance with guidelines and the regulation. The need to obtain the consent of patients in this retrospective study was not required by the ethics committee of the Guangzhou Women and Children’s Medical Center.
: Not applicable.
: The authors declare that they have no competing interests.