1. Information and Network Center, Xi’an University of Science and DSTechnology, Xi’an 710054, China
2. Department of Computer Science & IT, University of Malakand, Chakdara, Pakistan
3. School of Information Management and Engineering, Shanghai University of Finance and Economics, Shanghai 200433, China
4. School of Information Management, Shanghai Linxin University of Accounting and Finance, 995 Shangchuan Road, Pudong New District, Shanghai 201209, China
5. Department of Computer Science, University of Swat, Mingora, Pakistan