1. Department of Mathematics, Quaid-I-Azam University, Islamabad 45220, Pakistan
2. Department of Mathematics, Capital University of Science and Technology, Islamabad, Pakistan
3. Department of Mathematics and Sciences, Prince Sultan University, Riyadh 11586, Saudi Arabia
4. Department of Medical Research, China Medical University, Taichung 40402, Taiwan
5. Department of Mathematics, Kyung Hee University 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Korea
6. Department of Mathematics and applied Mathematics, Sefako Makgatho Health Sciences University, Garankuwa, Medusa 0204, South Africe