[Luo, Ping; Wu, Fang-Xiang] Univ Saskatchewan, Div Biomed Engn, Saskatoon, SK S7N 5A9, Canada.
[Tian, Li-Ping] Beijing Wuzi Univ, Sch Informat, Beijing 101149, Peoples R China.
[Chen, Bolin] Northwestern Polytech Univ, Sch Comp Sci, Xian 710072, Peoples R China.
[Xiao, Qianghua] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
[Wu, Fang-Xiang] Univ Saskatchewan, Dept Comp Sci, Saskatoon, SK S7N 5C9, Canada.