Funding for this research was provided by:
Japan Society for the Promotion of Science (JP18K05761)
Research Institute for Sustainable Humanosphere, Kyoto University (mission 1-1)
Text and Data Mining valid from 2019-08-09
Received: 3 March 2019
Accepted: 31 July 2019
First Online: 9 August 2019
: The authors declare that they have no competing interests.