1Department of Biomedical Engineering, Chung-Yuan Christian University, Taoyuan, Taiwan
2Department of Physical Medicine & Rehabilitation, Chang-Gung Memorial Hospital at Linkou and Chang-Gung University College of Medicine, Taoyuan, Taiwan
3Department of Physical Medicine & Rehabilitation, Chang-Gung Memorial Hospital at Taoyuan and Chang-Gung University College of Medicine, Taoyuan, Taiwan
4Department of Mechanical Engineering, National Taipei University of Technology, Taipei, Taiwan