Received: 28 May 2020
Accepted: 24 August 2020
First Online: 31 August 2020
Ethics approval and consent to participate
: The present study protocol was approved by the institutional review boards of The University of Tokyo (No. 11090) and Kyushu University (No. 28020). All participants provided informed consent.
: Not applicable.
: The authors declare that they have no competing interests.