Funding for this research was provided by:
Sanming Project of Medicine in Shenzhen (SZSM201612097)
Received: 1 November 2020
Accepted: 11 March 2021
First Online: 22 March 2021
: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. The study was conducted in accordance with the Declaration of Helsinki (as revised in 2013). The study was approved by Cancer Hospital & Shenzhen Hospital, Chinese Academy of Medical Sciences and PeKing Union Medical College Institutional Review Board of Clinical Research. (NO.: 2020–173) and individual consent for this retrospective analysis was waived.
: Not applicable.
: The authors have no conflicts of interest to declare.