Funding for this research was provided by:
Ministry of Health, Labour and Welfare
Ministry of Education, Culture, Sports, Science and Technology
Received: 4 March 2020
Accepted: 5 August 2020
First Online: 26 August 2020
Ethics approval and consent to participate
: This study was approved by the Kumamoto University Ethics Committee. Written informed consent was obtained from the patients or their parents (in cases where the patients were not of legal age).
: Not applicable.
: The authors declare that they have no competing interests.