Zhang, Chen
Wang, Weiwei
Chang, Xiaotian
Zhan, Siyan
Wang, Shengfeng
Feng, Lei
Song, Yongfeng
Funding for this research was provided by:
National Natural Science Foundation of China (81922016)
Natural Science Foundation of Shandong Province (ZR2019JQ25)
Article History
Received: 25 October 2022
Accepted: 24 May 2023
First Online: 1 June 2023
Declarations
:
: The Institutional Review Board of Peking University (Beijing, China) approved the study (IRB00001052-11015). All the participants provided signed informed consent at the time of participation. For those who receive no formal education, either they did not finish primary school or they received homeschool, they all provided signed informed consent. The study methodology was carried out in accordance with approved guidelines and regulations.
: Not applicable.
: The authors declare that they have no conflict of interest.