Received: 9 April 2020
Accepted: 11 August 2020
First Online: 18 August 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of the Sun Yat-sen University Cancer Center. All patients were systemically asked for consent to use their data anonymously for analysis and publication.
: Not applicable.
: There are no known conflicts of interest associated with this publication and there has been no significant financial support for this work that could have influenced its outcome.