Article History
Received: 24 April 2020
Accepted: 31 August 2020
First Online: 24 September 2020
Compliance with ethical standards
:
: The authors have no conflict of interest.
: The Shandong Provincial Cancer Research Institute Ethics Committee approved this study.
: Informed consent was obtained from all individual participants included in the study.
: Written informed consent for publication was obtained from all participants.