1. School of Statistics and Mathematics, Zhongnan University of Economics and Law, Wuhan, People's Republic of China
2. School of Mathematics and Statistics, Central China Normal University, Wuhan, People's Republic of China
3. Department of Statistics, Visva-Bharati University, Santiniketan, India
4. Department of Biostatistics and Data Science, Population Health Sciences Medical College of Georgia at the Augusta University, Augusta, GA, USA