Received: 17 December 2020
Accepted: 5 February 2021
First Online: 19 February 2021
Ethics approval and consent to participate
: This observational study was performed in accordance with the Declaration of Helsinki and approved by the Medical Ethics Committee of Sun Yat-sen University Cancer Center (B2020–063-01). All patients have signed the informed consent form before treatment.
: Not applicable.
: The authors report no conflicts of interest.