1. CES Laboratory, National Engineering School of Sfax (ENIS), University of Sfax, Sfax, Tunisia
2. ENIS, University of Sfax, Sfax, Tunisia
3. Department of Information Technology, College of Computer and Information Sciences, Princess Nourah bint Abdulrahman University, P.O.Box 84428, Riyadh, Saudi Arabia
4. Faculty of Engineering, Uni de Moncton, Moncton, NB, Canada