1. Product Design and Development Laboratory, Department of Industrial Design, College of Management, Chang Gung University, Taiwan
2. Healthy Aging Research Center, Chang Gung University, Taiwan
3. Department of Physical Medicine and Rehabilitation, Chang Gung Memorial Hospital, Taiwan
4. School of Medicine, College of Medicine, Taipei Medical University, Taiwan
5. Department of Physical Medicine and Rehabilitation, Taipei Medical University Hospital, Taiwan
6. Graduate Institute of Early Intervention, College of Medicine, Chang Gung University: No. 259 Wenhua 1st Rd., Kwei-Shan, Tao-Yuan City 333, Taiwan