Funding for this research was provided by:
Japan Society for the Promotion of Science [JSPS KAKENHI] (15H04661)
Text and Data Mining valid from 2019-04-16
Received: 28 January 2019
Accepted: 9 April 2019
First Online: 16 April 2019
Compliance with ethical standards
: The authors declare no conflicts of interests in association with this manuscript.