Funding for this research was provided by:
Ministry of Education, Sports and Sciences
Text and Data Mining valid from 2020-03-24
Received: 30 April 2019
Revised: 29 February 2020
Accepted: 14 March 2020
First Online: 24 March 2020
: It is to confirm that there are no known conflicts of interest associated with this study and there has been no significant financial support for this work that could have influenced its outcome.