Funding for this research was provided by:
National Natural Science Foundation of China (81672197)
Received: 1 July 2020
Accepted: 17 November 2020
First Online: 24 November 2020
Ethics approval and consent to participate
: The protocol of this clinical study was reviewed and approved by the research ethics committee in the Affiliated Hospital of Qingdao University.
: Not Applicable.
: The authors declare no competing financial interests.