Funding for this research was provided by:
Japan Society for the Promotion of Science (JP19K16577)
Received: 9 October 2020
Accepted: 21 December 2020
First Online: 12 January 2021
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of Yamagata University Faculty of Medicine (2020-S-24) and was performed in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.