1. Guangxi University of Science and Technology, Liuzhou, Guangxi Zhuang Autonomous Region, China
2. Shenzhen Institute of Geriatrics, Shenzhen, Guangdong, China
3. The First Affiliated Hospital of Shenzhen University, Shenzhen, Guangdong, China
4. South China University of Technology, Guangzhou, Guangdong, China
5. MK Smart Robot Ltd, Huahaotai Industrial Park, Shenzhen, Guangdong, China
6. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong, China
7. Stroke Biological Recovery Laboratory, Spaulding Rehabilitation Hospital, Harvard Medical School, Boston, MA, USA