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Authors
Ren, J.
Sun, Y.
Dai, B.
Song, W.
Tan, T.
Guo, L.
Cao, H.
Wu, Y.
Hu, W.
Wang, Z.
Haiping, D.
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Article History
Received: 19 November 2021
Revised: 21 January 2022
Accepted: 3 February 2022
First Online: 11 October 2022
COMPLIANCE WITH ETHICAL STANDARDS
: Conflict of interest . The authors declare that they have no conflicts of interest.
: Statement of compliance with standards of research involving humans as subjects . All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the Ethics Committee of Medicine at Qingdao Centre for Disease Control and Prevention (ID:201804, approval data July 12, 2018). Informed consent was obtained from all individual participants included in the study.
