Funding for this research was provided by:
Japan Agency for Medical Research and Development (JP20dk0110030)
Received: 8 September 2020
Accepted: 9 November 2020
First Online: 18 November 2020
Ethics approval and consent to participate
: Jichi Medical University Bioethics Committee for Medical Research approved the study and waived the requirement for informed consent of each participant (Receipt ID: 20–058).
: Not applicable.
: The authors declare that they have no competing interests.