Article History
Received: 8 July 2020
Accepted: 1 September 2020
First Online: 10 September 2020
Ethics approval and consent to participate
: This study was conducted in accordance with the Declaration of Helsinki. Ethical approval was granted by the Institutional Review Board of Hiroshima University (#Rin 339-1). Written informed consent was obtained from all participants.
: Not applicable.
: The authors have no competing interests.