1. State Key Laboratory of Virtual Reality Technology and Systems; Beihang University; Beijing China
2. Department of Computer Science; Stony Brook University (SUNY Stony Brook); Stony Brook New York USA
3. State Key Laboratory of Robotics, Shenyang Institute of Automation; Chinese Academy of Sciences; Shenyang China
4. The Affiliated Hospital of Qingdao University; Qingdao China