[1] State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing,100876, China
[2] Aba Teachers University, Aba,623002, China
[3] School of Economic Information Engineering, Southwestern University of Finance and Economics, Chengdu,611130, China
[4] School of Public Health and Management, Chongqing Medical University, Chongqing,400016, China