Funding for this research was provided by:
This research was supported in part by the Grants-in-Aid for Scientific Research from the Japan Society for Promotion of Science (18K05645)
Text and Data Mining valid from 2019-11-30
Received: 24 May 2019
Accepted: 21 July 2019
First Online: 30 November 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.