1. Laboratory of Mathematics, University of Saïda–Dr. Moulay Tahar, P.O. Box 138, EN-Nasr, 20000 Saïda, Algeria
2. Laboratory of Mathematics, Djillali Liabes University of Sidi Bel-Abbes, P.O. Box 89, Sidi Bel-Abbes 22000, Algeria
3. Division of Applied Mathematics, Thu Dau Mot University, Binh Duong Province, Vietnam
4. Department of Mathematics, Cankaya University, 06790 Etimesgut, Ankara, Turkey
5. Department of Medical Research, China Medical University Hospital, China Medical University, 40402 Taichung, Taiwan