Received: 20 December 2020
Accepted: 8 February 2021
First Online: 23 February 2021
Ethics approval and consent to participate
: This study complied with the Declaration of Helsinki and was approved by the institutional review board of Sun Yat-sen University Cancer Center. Informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare that there is no conflict of interests in this study.