1. College of Mathematics and Statistics, Cangzhou Normal University, Cangzhou 061001, China
2. Department of Applied Mathematics, Faculty of Mathematical Sciences, University of Tabriz, Tabriz, Iran
3. Natural Sciences Faculty, Lankaran State University, 50, H. Aslanov Str., Lankaran, Azerbaijan
4. Department of Statistics, Faculty of Physical Sciences, Shah Abdul Latif University Khairpur, Sindh, Pakistan
5. Banking University, Ho Chi Minh City, Vietnam
6. International University of Japan, Niigata, Japan
7. Dai Nam University, Vietnam