Funding for this research was provided by:
Japan Society for the Promotion of Science (KAKENHI JP26249029)
Japan Science and Technology Agency (COI Program)
Text and Data Mining valid from 2019-06-07
Received: 8 November 2018
Accepted: 28 May 2019
First Online: 7 June 2019
Availability of data and materials
: Not applicable.
: The authors declare that they have no competing interests.