1. Department of Computer System and Technology, Faculty of Computer Science and Information Technology, University of Malaya, Kuala Lumpur 50603, Malaysia
2. Department of Software Engineering, Faculty of Computer Science and Information Technology, University of Malaya, Kuala Lumpur 50603, Malaysia
3. Faculty of Computing and Informatics, Universiti Malaysia Sabah (UMS), Kota Kinabalu 88400, Malaysia
4. Khawarizmi International College, Abu Dhabi P.O. Box 25669, United Arab Emirates
5. Department of Computer Science, Applied College, King Khalid University, Muhayil 61913, Saudi Arabia