About the Authors

Jianhong Zhu

Roles Writing – original draft

zhujianhong1995@gmail.com

Affiliation Graduate School of Humanities and Social Sciences, Hiroshima University, Hiroshima, Japan

Junya Hashimoto

Roles Writing – review & editing

Affiliation Graduate School of Education, Hiroshima University, Hiroshima, Japan

Kentaro Katahira

Roles Writing – review & editing

Affiliation Graduate School of Informatics, Nagoya University, Nagoya, Japan

Makoto Hirakawa

Roles Writing – review & editing

Affiliation Graduate School of Humanities and Social Sciences, Hiroshima University, Hiroshima, Japan

Takashi Nakao

Roles Writing – review & editing

Affiliation Graduate School of Humanities and Social Sciences, Hiroshima University, Hiroshima, Japan

Competing Interests

The authors have declared that no competing interests exist.