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Article History

Received: 1 February 2021

Accepted: 8 July 2021

First Online: 27 July 2021

Declarations

:

: The authors declare that they have no conflict of interest.

: The study was approved by Ethical Committee of Weifang Weiyi Tumor Hospital and conducted in accordance with the ethical standards. Approval No. 2012-11.

: All procedures carried out in studies involbing human participants are consistent with the ethical standards of institutions and/or national research councils, as well as with the 1964 Helsinki Declaration and its subsequent amendments or similar ethical standards.

: Subjects signed the informed consent.