Received: 11 November 2019
Accepted: 19 November 2020
First Online: 5 January 2021
Ethics approval and consent to participate
: The study was reviewed and approved by the Faculty of Science Ethics Committee at Liaoning Cancer Hospital and Institute (Cancer Hospital of China Medical University). This is a retrospective study and all patients have signed the informed consent prior to treatment.
: Not applicable.
: The authors declare that they have no competing interests.