1. Department of Orthopedics, E-Da Hospital, Kaohsiung City 824, Taiwan
2. School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung City 824, Taiwan
3. Department of Physical Therapy, College of Medicine, National Cheng Kung University, Tainan City 701 Taiwan
4. Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan City 701, Taiwan