Funding for this research was provided by:
Scientific Research (B) from the Ministry of Education, Culture, Sports, Science, and Technology (24310055)
Text and Data Mining valid from 2019-12-12
Received: 8 August 2019
Revised: 13 November 2019
Accepted: 28 November 2019
First Online: 12 December 2019
Compliance with ethical standards
: The authors declare that they have no competing interests.
: This article does not contain any studies with human participants or animals performed by any of the authors.