About the Authors

Shih-Yung Wei

Roles Formal analysis

Affiliation School of Mathematics & Statistics, Shaoguan University, Shaoguan City, Guangdong, China

Li-Wei Lin

Roles Conceptualization

linlw1982@gmail.com

Affiliation College of Business Administration, Fujian Jiangxia University, Fuzhou City, Fujian, China

Competing Interests

The authors have declared that no competing interests exist.