Funding for this research was provided by:
Japan Society for the Promotion of Science (JP 18K17909)
Received: 12 May 2020
Accepted: 23 September 2020
First Online: 1 October 2020
Ethics approval and consent to participate
: This study was conducted in accordance with the Declaration of Helsinki. Informed consent to participate in the study was obtained from the participants verbally and in writing. This study was approved by the Ethical Review Board of the Kibi International University (No. 18-37).
: Not applicable.
: The authors declare that they have no competing interests.