1. Department of Mathematics and Statistics, University of Victoria, Victoria, Canada
2. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
3. Center for Converging Humanities, Kyung Hee University, Seoul, Republic of Korea
4. Department of Applied Mathematics, Chung Yuan Christian University, Taoyuan City, Taiwan
5. Department of Mathematics and Informatics, Azerbaijan University, Baku, Azerbaijan
6. Department of Mathematics, Faculty of Sciences at Gabes, University of Gabes, Gabes, Tunisia
7. Department of Mathematics, Faculty of Sciences at Monastir, University of Monastir, Monastir, Tunisia