About the Authors

Fan Xia

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Validation, Visualization, Writing – original draft, Writing – review & editing

Affiliation School of Mathematics and Statistics, Xi’an Jiaotong University, Xi’an, China

Yanni Xiao

Roles Conceptualization, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Validation, Writing – review & editing

Affiliation School of Mathematics and Statistics, Xi’an Jiaotong University, Xi’an, China

Junling Ma

Roles Funding acquisition, Investigation, Methodology, Project administration, Supervision, Validation, Writing – review & editing

junlingm@uvic.ca

Affiliation Department of Mathematics and Statistics, University of Victoria, Victoria, Canada

Competing Interests

The authors have declared that no competing interests exist.