Funding for this research was provided by:
Japan Agency for Medical Research and Development (18ck0106210h0003, 19ck0106485h001)
National Cancer Center Research and Development Fund (31-A-17)
Received: 30 April 2020
Accepted: 3 June 2020
First Online: 22 June 2020
Ethics approval and consent to participate
: The study was approved by National Cancer Center Hospital East (NCCHE) Institute Research Ethics Committee (Reference number: 2017–440).
: Not applicable.
: The authors declare that they have no competing interest.