Funding for this research was provided by:
Japan Society for the Promotion of Science
Received: 28 April 2021
Accepted: 19 August 2021
First Online: 27 August 2021
: The present study was approved by the Research Ethics Committee of the Kindai University Faculty of Medicine. The parent or guardian of each child read an information letter about the present study and provided their informed consent before the child participated.
: Not applicable.
: The authors declare that they have no competing interests.