1. College of Computer Science and Technology, Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education, Jilin university, Changchun, China
2. Joint NTU-UBC Research Centre of Excellence in Active Living for the Elderly, Nanyang Technological University, Singapore
3. School of Computer Science, University of Science and Technology of China, Hefei, China
4. College of Software, Jilin University, Changchun, China
5. College of Computer Science and Technology, Dalian University of Technology, Dalian, China
6. Department of Electrical Engineering and Computer Science, Bond Life Sciences Center, University of Missouri, Columbia, USA
7. School of Computer Science, Zhuhai College of Science and Technology, Zhuhai, China