1. Department of Mathematics and Sciences, College of Humanities and Sciences, Prince Sultan University, Riyadh, Saudi Arabia
2. Department of Mathematics, Air University, Islamabad, Pakistan
3. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
4. Department of Mathematics, Faculty of Science, The Hashemite University, Zarqa, Jordan
5. Department of Mathematics, College of Sciences, King Khalid University, Abha, Saudi Arabia