Yang, Shijun
Li, Jie
Fu, Peipei
Chen, Yan
Wang, Yi
Zhao, Dan
Li, Zhixian
Li, Wenjuan
Li, Jie
Yan, Chen
Gui, Zhen
Zhou, Chengchao
Article History
Received: 16 February 2021
Accepted: 8 October 2021
First Online: 20 October 2021
Declarations
:
: The Ethical Committee of the School of Public Health at Shandong University approved the study protocol. The investigation was conducted after written informed consent was obtained from all participants. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.