About the Authors

Nobuhiro Mifune

n.mifune@gmail.com

Affiliation School of Economics and Management, Kochi University of Technology, Kochi-city, Kochi, Japan

Yoichi Hizen

Affiliation School of Economics and Management, Kochi University of Technology, Kochi-city, Kochi, Japan

Yoshio Kamijo

Affiliation School of Economics and Management, Kochi University of Technology, Kochi-city, Kochi, Japan

Yoshitaka Okano

Affiliation School of Economics and Management, Kochi University of Technology, Kochi-city, Kochi, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NM YH YK YO. Performed the experiments: NM YH YK YO. Analyzed the data: NM. Contributed reagents/materials/analysis tools: NM. Wrote the paper: NM YH YK YO.