Funding for this research was provided by:
grants from the Ministry Science and Technology of China (2016YFC0901200, 2016YFC0901205)
research grants from Health and Family Planning Commission of Sichuan Province (16129)
Received: 18 February 2021
Accepted: 1 September 2021
First Online: 15 September 2021
: The study was approved by the ethics committee of the Affiliated Hospital of Southwest Medical University. Written informed consent was obtained before the data collection and analysis.
: Not applicable.
: The authors declare that they have no competing interests.