About the Authors

Yoshinori Sugiura
Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima City, Hiroshima Prefecture, Japan

Corresponding Author

ysugiura@hiroshima-u.ac.jp

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YS. Performed the experiments: YS. Analyzed the data: YS. Wrote the paper: YS.