1. Department of Mathematics and Statistics, University of Victoria, Victoria, BC V8W 3R4, Canada
2. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung 40402, Taiwan
3. Center for Converging Humanities, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea
4. Department of Mathematics and Informatics, Azerbaijan University, 71 Jeyhun Hajibeyli Street, Baku AZ1007, Azerbaijan
5. Department of Applied Mathematics, Chung Yuan Christian University, Chung-Li, Taoyuan City 32023, Taiwan
6. Section of Mathematics, International Telematic University Uninettuno, 00186 Rome, Italy
7. Department of Mathematics, Faculty of Science, Urmia University, Urmia 57561-51818, Iran
8. Department of Mathematics, Walchand College of Engineering, Sangli 416415, Maharashtra, India