About the Authors

Jin Lu

Roles Conceptualization, Formal analysis, Methodology, Resources, Visualization, Writing – original draft

Affiliation Guangdong Key Laboratory of Big Data Intelligence for Vocational Education, Shenzhen Polytechnic University, Shenzhen, Guangdong, China

Ji Li

Roles Data curation, Investigation, Methodology, Software, Writing – review & editing

liji@szpu.edu.cn

Affiliation Research Management Office, Shenzhen Polytechnic University, Shenzhen, Guangdong, China

Competing Interests

The authors have declared that no competing interests exist.