1. Department of Mathematics and Sciences, Prince Sultan University, Riyadh 11586, Saudi Arabia
2. Department of Medical Research, China Medical University, Taichung 40402, Taiwan
3. Department of Mathematics, College of Education, University of Sulaimani, Sulaimani 46001, Iraq
4. Department of Mathematics and Statistics, University of Victoria, BC V8W 3R4, Canada
5. Department of Mathematics and Informatics, Azerbaijan University, AZ1007 Baku, Azerbaijan
6. Center for Converging Humanities, Kyung Hee University, Dongdaemun-gu, Seoul 02447, Republic of Korea
7. Department of mathematics, Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates
8. Department of mathematics, Al-Hussein Bin Talal University, P.O. Box 33011, Ma'an, Jordan
9. Department of Mathematics, Faculty of Technical and Natural Sciences, University "Ismail Qemali", 9400 Vlora, Albania
10. Department of Mathematics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand