Funding for this research was provided by:
Japan Society for the Promotion of Science (16K15847)
Text and Data Mining valid from 2020-01-15
Received: 6 August 2019
Accepted: 8 January 2020
First Online: 15 January 2020
Ethics approval and consent to participate
: All procedures were evaluated and approved by the ethical committee of Showa University (No. 2016-011).
: Not applicable.
: The authors declare that they have no competing interests.