1. Department of Orthopedic Surgery, Taipei Medical University–Wan Fang Hospital, Taipei, Taiwan
2. Department of Orthopedic Surgery, Chang Gung Memorial Hospital–Keelung, Keelung, Taiwan
3. Department of Orthopedic Surgery, Taipei Medical University, Taipei, Taiwan
4. School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan
5. Department of Medical Research, Mackay Memorial Hospital, Taipei, Taiwan