Received: 9 June 2020
Accepted: 9 November 2020
First Online: 4 January 2021
Ethics approval and consent to participate
: The use of human blood sample and the protocol in this study were strictly comply with the criterions of the Declaration of Helsinki and were approved by the Ethics Committee of Shaanxi Provincial Tumor Hospital and Tang du physical examination center. Written informed consent was received from each participant.
: Not applicable.
: The authors declare that they have no competing interest.