1. Department of Mechanical Engineering, Sarhad University of Science and IT, Ring Road, Peshawar, Pakistan
2. Department of Mathematics, COMSATS University Islamabad, Wah Campus, Pakistan
3. Department of Mathematics and Statistics, University of Victoria, Victoria, British Columbia V8W 3R4, Canada
4. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung 40402, Taiwan