Funding for this research was provided by:
Ministry of Education, Culture, Sports, Science and Technology (the Center of Community)
Japan Agency for Medical Research and Development (Research on Development of New Medical Devices)
Grants-in-Aid for Scientific Research from the Japan Society (16K17469, 15K08093)
MEXT and AMED (development of supportive device technology for medicine using ICT, Research)
Received: 4 May 2019
Accepted: 23 May 2020
First Online: 5 June 2020
Ethics approval and consent to participate
: The study protocol was approved by the ethics committee of each university and conformed to the tenets of the Declaration of Helsinki (as revised in 2000). After a complete explanation of the study, all participants or their parents/legal guardians provided written informed consent.
: These data were anonymously collected after obtaining the consent of participants.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.