Funding for this research was provided by:
Ministry of Education, Science, Sports, and Culture (17KT0034)
Ministry of Education, Science, Sports, and Culture (Post-K computer)
Article History
Received: 28 February 2019
Accepted: 18 June 2019
First Online: 19 August 2019
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.