1. Department of Mathematics and Natural Sciences, Prince Mohammad Bin Fahd University, P.O. Box: 1664, Al Khobar 31952, Saudi Arabia
2. Universite de Sousse, Institut Superieur d Informatique et des Techniques de Communication, H. Sousse 4000, Tunisia
3. China Medical University Hospital, China Medical University, Taichung 40402, Taiwan
4. Department of Mathematics, G. F. College, Shahjahanpur 242001, India
5. Department of Mathematics, Integral University Campus, Shahjahanpur 242001, India
6. Department of Mathematics, Aden University, Aden, Yemen