Funding for this research was provided by:
Japan Society for the Promotion of Science (JP16H04897)
Text and Data Mining valid from 2019-04-05
Received: 6 November 2018
Revised: 4 February 2019
Accepted: 23 February 2019
First Online: 5 April 2019
Compliance with ethical standards
: This article does not contain any studies with human participants performed by any of the authors.
: The authors declare that they have no competing interests.