Funding for this research was provided by:
National Natural Science Foundation of China (81972130, 81703896, 81972107, 81902203, 82072494)
Beijing Municipal Science and Technology Commission (Z171100001017209)
Capital Health Research and Development of Special (2020-2-4067)
Received: 13 October 2020
Accepted: 28 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: This study dealt with published data only; no ethical approval was needed.
: Not applicable.
: The authors declare that they have no competing interests.