1. Department of Computer Science, Norwegian University of Science and Technology, NTNU, Trondheim, Norway;
2. Faculty of Computer Systems and Software Engineering, Universiti Malaysia Pahang, Kuantan, Malaysia;
3. Universiti Teknologi Malaysia, Skudai, Malaysia;
4. International Islamic University Malaysia, Kuala Lumpur, Malaysia;
5. Universiti Malaysia Kelantan, Pengkalan Chepa, Malaysia