1. Intelligent Control and Robotics Institute, College of Automation, Hangzhou Dianzi University, Hangzhou, China
2. Seven Lakes High School, Katy, TX, USA
3. Department of Biomedical Engineering, University of Houston, Houston, TX, USA
4. Department of Physical Medicine and Rehabilitation, University of Texas Health Science Center at Houston, Houston, TX, USA
5. Faculty of Rehabilitation Engineering, University of Health and Rehabilitation Sciences, Qingdao, China