1. Department of Mathematics, Shaheed Benazir Bhutto Women University, Peshawar, Pakistan
2. Department of Mathematics, University of Peshawar, Peshawar, Khyber Pakhtunkhwa, Pakistan
3. Department of Mathematics, University of Swabi, Swabi, Khyber Pakhtunkhwa, Pakistan
4. Department of Mathematical Sciences, UAE University, P.O. Box, 15551 Al Ain, UAE
5. Department of Mathematics, Çankaya University, Ankara 06790, Turkey
6. Department of Medical Research, China Medical University, Taichung 40402, Taiwan