1. Department of Orthopedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
2. School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, ROC
3. Department of Orthopedic Surgery, Taipei City Hospital, RenAi Branch, Taipei, Taiwan, ROC
4. Department of Orthopedics, China Medical University Hsinchu Hospital, Hsinchu, Taiwan, ROC