Funding for this research was provided by:
National Research Foundation of Korea (2013R1A6A3A04059017, 2018R1A2B6004608)
National Cancer Center (NCC-1810220-01)
Received: 26 May 2020
Accepted: 21 October 2020
First Online: 9 November 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of the National Cancer Center (IRB code NCC2018–0017).
: Not applicable.
: The authors declare that they have no competing interests.