Funding for this research was provided by:
Received: 22 December 2019
Accepted: 16 November 2020
First Online: 23 November 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Kyushu University (Approval No. H24-02, 685-00). All subjects of this study gave their written informed consent to participate in this study.
: Not applicable.
: The authors have no conflicts of interest.