Li, Ang
Wang, Ni
Ge, Lingzhi
Xin, Hongyan
Li, Wenfei
Article History
Received: 24 April 2020
Accepted: 15 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: This prospective study was formally approved by the ethics committee of the First Affiliated Hospital of Shandong First Medical University (Ethic approval No. 20140020). The signed informed consent was obtained from all participants before investigation.
: Not applicable.
: The authors declare that they have no competing interests.