Song, Wanxue
Cao, Hainan
Zhang, Dongfeng
Xu, Haiyan
Zhang, Qianqian
Wang, Zhaoguo
Li, Suyun
Wang, Weijing
Hu, Wenchao
Wang, Bingling
Duan, Haiping
Article History
Received: 12 April 2021
Accepted: 22 July 2021
First Online: 28 July 2021
Declarations
:
: This study was approved by the Medical Ethics Committee of Qingdao Municipal Center for Disease Control and Prevention in Qingdao, China (ID:201804, approval data July 12, 2018). All subjects signed informed consent forms.
: Written informed consent for publication was obtained from all participants.
: The authors declare that they have no competing interests.