Jiang, Fachun
Wei, Tao
Hu, Xiaowen
Han, Yalin
Jia, Jing
Pan, Bei
Ni, Wei
Funding for this research was provided by:
Qingdao Science and Technology Project (No.19-6-1-1-nsh)
Article History
Received: 17 November 2019
Accepted: 8 September 2021
First Online: 21 September 2021
Declarations
:
: This study was approved by the Ethics Commission of Qingdao Municipal Center for Disease Control and Prevention (Date: 18 Oct, 2019; Number: QFELL-KY-2019-67), and written informed consent was not applicable. There is no administrative permission required to access the raw data, and the data used in this study was anonymised before its use.
: Not applicable.
: The authors declare that they have no competing interests.