School of Information Science and Engineering, Central South University, Changsha, China.|School of Information Science and Engineering, Central South University, Changsha, China.|School of Information Science and Engineering, Central South University, Changsha, China.|School of Information Science and Engineering, Central South University, Changsha, China.|Division of Biomedical Engineering, University of Saskatchewan, Saskatoon, Canada.|Department of Computer Science, Georgia State University, Atlanta, GA, USA.|School of Information Science and Engineering, Central South University, Changsha, China.