Funding for this research was provided by:
Japan Society for the Promotion of Science (15K16283, 26220202)
Tokyo Metropolitan Government
Green Network of Excellence project
Data Integration & Analysis System
Text and Data Mining valid from 2018-03-26
Received: 7 July 2017
Accepted: 13 March 2018
First Online: 26 March 2018
: IA is an associate professor at Senshu University. HK is an associate professor at Hokkaido University, and JM is a professor at Tokyo Metropolitan University. EO, GR, and FH are researchers at PAGASA.
: The authors declare that they have no competing interests.
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