About the Authors

Wang Qing

Roles Conceptualization, Data curation, Formal analysis

Affiliation School of Information Technology in Education, South China Normal University, Guangzhou, China

Zhang Xuebo

Roles Data curation, Formal analysis

zhangxb@126.com

Affiliation School of Information Technology in Education, South China Normal University, Guangzhou, China

Competing Interests

The authors have declared that no competing interests exist.