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, Seoul 02447, Republic of Korea
4. Department of Mathematics and Informatics, Azerbaijan University, Baku AZ100, Azerbaijan
5. Section of Mathematics, International Telematic University Uninettuno, I-00186 Rome, Italy
6. Department of Applied Mathematics, Chung Yuan Christian University, Chung-Li, Taoyuan City 320314, Taiwan
7. Department of Mathematics, “1 Decembrie 1918” University of Alba Iulia, 510009 Alba Iulia, Romania
8. Department of Mathematics, Abbottabad University of Science and Technology, Abbottabad 22500, Pakistan
9. Mathematics Department, College of Science, King Saud University, P.O. Box 22452, Riyadh 11495, Saudi Arabia