Funding for this research was provided by:
Japan Society for the Promotion of Science (JP17K08924 & JP20K10384)
Received: 5 May 2020
Accepted: 16 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: The study was approved by Jichi Medical University Clinical Research Ethics Committee (reference number: 18–168). Informed consent was obtained from all participants. The same statement is written at the end of the Introduction section.
: Informed consent was obtained from all participants for publication. All the authors have approved this publication.
: The authors report no conflicts of interest.