1. School of Statistics and Information, Shanghai University of International Business and Economics, Shanghai, People's Republic of China
2. School of Industrial Engineering, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
3. Department of Statistics, Pontificia Universidad Católica de Chile, Santiago, Chile
4. School of Mathematics, Shanghai University of Finance and Economics, Shanghai, People's Republic of China
5. Faculty of Science and Technology, University of Canberra, Canberra, Australia