1. Department of Education, Chang Gung Memorial Hospital, Linkou, Taiwan
2. School of Medicine, Chang Gung University, Taoyuan, Taiwan
3. Department of Physical Medicine and Rehabilitation, Chi Mei medical center, Tainan, Taiwan
4. Medical Research Department, Chi-Mei Medical Center, Tainan, Taiwan
5. Department of Orthopedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan
6. School of Medicine, National Yang Ming Chiao Tung University Taipei, Taipei, Taiwan.