About the Authors

Kazuya Yamamoto

Roles Conceptualization, Formal analysis, Investigation, Methodology, Project administration, Resources, Supervision, Validation, Writing – original draft, Writing – review & editing

yamamoto@cc.kyoto-su.ac.jp

Affiliation Department of International Relations, Kyoto Sangyo University, Kyoto, Japan

Competing Interests

The authors have declared that no competing interests exist.