1. School of Electronic and Information Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2. Department of Computer Science, University of Swabi, Swabi, Pakistan
3. Department of Accounting & Information Systems College of Business & Economics Qatar, Qatar University, Doha, Qatar
4. Department of Computer Science, Abdul Wali Khan University Mardan, Mardan, Pakistan
5. School of Computer Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China