Article History
Received: 5 December 2019
Accepted: 1 June 2020
First Online: 8 June 2020
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of Osaka University (No.18041). All participants were provided with a face-to-face explanation regarding the purposes and methods of the study before providing their written consent.
: Not applicable.
: The authors declare that they have no competing interests.