Received: 6 May 2020
Accepted: 18 November 2020
First Online: 7 December 2020
Ethics approval and consent to participate
: This study was approved by the institutional review board of the Medical Governance Research Institute (Tokyo, Japan) (Approval Number; MG2018–12). All study participants gave written informed consent before check-ups.
: Not applicable.
: The authors declare that they have no competing interests.