Received: 3 July 2020
Accepted: 6 January 2021
First Online: 22 February 2021
Ethics approval and consent to participate
: The study protocol was approved by the Ethical Review Board of the Saiseikai Matsuyama Hospital, and written informed consent was obtained from all participants.
: All the participants in this study provided written consent for publication.
: The authors declare that they have no competing interests.