1. Department of Rehabilitation Medicine, The 1st Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
2. Motion Analysis & Motor Performance Laboratory, Department of Orthopedics and Mechanical Engineering, University of Virginia, Charlottesville, VA 22903, USA
3. Department of Neurology, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen 518107, China
4. Department of Kinesiology, California State University East Bay, Hayward, CA, USA