Funding for this research was provided by:
Ministry of Health, Labour and Welfare (H30-choju-ipan-007)
Japan Society for the Promotion of Science (JP19K24161)
Received: 13 February 2020
Accepted: 27 July 2020
First Online: 9 August 2020
Ethics approval and consent to participate
: This research was conducted with permission from the Ethics Review Committees of the University of Tokyo (Approval No. 11070–2) and the University of Tsukuba (Approval No. 1324).
: Not applicable.
: The authors declare that they have no competing interests.