Wei, Zhang
Li, Wang
Lei, Cao
Caixia, An
Chuan, Zhang
Jianqin, Wang
Article History
Received: 1 December 2022
Accepted: 7 February 2023
First Online: 13 April 2023
Declarations
:
: The present study was conducted according to the guidelines laid down in the Declaration of Helsinki and all study procedures were ethically approved by the Gansu Provincial Maternity and Child Care Hospital (GSMCH) Institutional Review Board. Written informed consent was obtained from all of the adult participants with good level of education. Written informed consent of the subjects with no formal education or less education were obtained from their legal guardians.
: Not applicable.
: The authors declare no competing interests.