1. Department of Mechanical Engineering, College of Engineering and Technology, Muscat P.O. Box 2546, Oman
2. Management and Humanities Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Malaysia
3. Department of Management Sciences, Lahore Garrison University, Lahore 54000, Pakistan
4. School of Business Management, College of Business, Universiti Utara Malaysia, Bukit Kayu Hitam 06010, Malaysia