1. Oil and Gas Engineering Programme, Faculty of Engineering, Universiti Malaysia Sabah, Jalan UMS, Kota Kinabalu, Sabah, Malaysia
2. Department of Dentistry, Alsalam University College, Baghdad, Iraq
3. Department of Chemical Engineering, College of Engineering, Universiti Malaysia Pahang, Lebuhraya Tun Razak, Gambang, Kuantan, Pahang, Malaysia
4. Department of Production Engineering and Metallurgy, University of Technology-Iraq, Baghdad, Iraq