1. Department of Mathematics, University of Lahej, Lahej, Yemen
2. Department of Mathematics, University of Aden, Aden, Yemen
3. Department of Mathematics, Faculty of Science, The Hashemite University, P.O. BOX 330127, Zarqa 13133, Jordan
4. Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
5. Department of Mathematics, Faculty of Science, University of Zakho, Duhok-42001, Iraq
6. Department of Mathematics, Azarbaijan Shahid Madani University, Tabriz, Iran
7. Department of Mathematics, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul, Republic of Korea
8. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan