Niu, Yunfei
Article History
Received: 8 January 2023
Accepted: 10 June 2023
First Online: 22 June 2023
Declarations
:
: The study protocol was approved by the Ethics Committee of Tangshan Normal University, Tangshan, Hebei, China. The study was conducted following the rules of the Declaration of Helsinki. All subjects gave written informed consent before participation.
: Not applicable.
: This research has no conflict of interest.