Funding for this research was provided by:
G-7 Scholarship Foundation
Taiju Life Social Welfare Foundation
Received: 19 December 2020
Accepted: 13 February 2021
First Online: 19 April 2021
Ethics approval and consent to participate
: The ethics committees for human research of our institutes approved the study design and protocol (IRB Number: Rakuoto-Rin-17-041 and R2019-227).
: Not applicable.
: The authors declare that they have no competing interests.