1. Department of Physical Medicine and Rehabilitation, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan 704, Taiwan
2. Department of Physical Medicine and Rehabilitation, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan
3. Faculty of Information Technology, Monash University, Victoria 3800, Australia
4. Department of Industrial Design, National Cheng Kung University, Tainan 701, Taiwan
5. Department of Statistics, College of Management, National Cheng Kung University, Tainan 701, Taiwan