1. Department of Computer Science, Allama Iqbal Open University, Islamabad, Pakistan
2. Abu Dhabi School of Management, Abu Dhabi, UAE
3. College of Computer and Information Sciences, Prince Sultan University, Riyadh, Saudi Arabia
4. Department of Computer Science, College of Computers and Information Technology, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia