Funding for this research was provided by:
the key research and development program of hebei province (19277714D)
Received: 19 July 2021
Accepted: 30 November 2021
First Online: 14 December 2021
: Ethical approval for this study was not necessary because the study was a review of existing literature and did not involve the processing of any individual patient data.
: Not applicable.
: The authors declare no conflicts of interest.