1. Beijing Key Laboratory of Human Computer Interactions, Institute of Software, Chinese Academy of Sciences, Beijing, China
2. BNRist, MOE-Key Laboratory of Pervasive Computing, the Department of Computer Science and Technology, Tsinghua University, Beijing, China
3. CAS Key Laboratory of Behavioral Science, Institute of Psychology, Beijing, China
4. School of Computer Science and Informatics, Cardiff University, Cardiff, Wales, U.K.
5. State Key Laboratory of Computer Science, Institute of Software, Chinese Academy of Sciences, Beijing, China