1. Department of Mathematics, University of Management and Technology, Lahore 54770, Pakistan
2. Department of Applied Mathematics, Northwestern Polytechnical University, Xi’an 710072, China
3. Department of Mathematics, Cankaya University, 06790 Etimesgut, Ankara, Turkey
4. Department of Mathematics, King Abdulaziz University, Saudi Arabia
5. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan