1. Department of Mathematics, College of Science, King Khalid University, Abha, Saudi Arabia
2. Department of Mathematics, COMSATS University of Islamabad, Punjab, Pakistan
3. Department of Mathematics and Sciences, Prince Sultan University, Riyadh, Saudi Arabia
4. Department of Mathematics, University of Malakand, Khyber Pakhtunkhwa, Pakistan
5. Department of Medical Research, China Medical University, Taichung, Tiawan