1. Université de Sousse, Institut Supérieur d'Informatique et des Techniques de Communication, H. Sousse 4000, Tunisia
2. China Medical University Hospital, China Medical University, Taichung 40402, Taiwan
3. Department of Mathematics and Applied Mathematics, Sefako Makgatho Health Sciences University, Ga-Rankuwa, South Africa
4. Department of Mathematics, Capital University of Science and Technology, Islamabad, Pakistan
5. Department of Mathematics, College of Sciences, King Khalid University, Abha 61413, Saudi Arabia
6. Department of Mathematics, Taiz University, Taiz 6803, Yemen