[1
]
School of Information Science and Engineering, Central South University, Changsha
410083, China.
[2
]
School of Information Science and Engineering, Central South University, Changsha
410083, China. Electronic address: limin@mail.csu.edu.cn.
[3
]
School of Information Science and Engineering, Central South University, Changsha
410083, China. Electronic address: jxwang@mail.csu.edu.cn.
[4
]
School of Information Science and Engineering, Central South University, Changsha
410083, China; Department of Computer Science, Georgia State University, Atlanta,
GA 30302-4110, USA.
[5
]
School of Information Science and Engineering, Central South University, Changsha
410083, China; Division of Biomedical Engineering and Department of Mechanical Engineering,
University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada.