1. Department of Orthopedics & Traumatology, Taipei Veterans General Hospital, Taipai 11217 Taiwan
2. Department of orthopedics, Therapeutical and Musculoskeletal Tumor Research Center, Taipei Veterans General Hospital, Taipai 11217 Taiwan
3. Orthopedic Department, School of Medicine, National Yang-Ming University, Taipai 11221 Taiwan
4. Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, Taipai 11221 Taiwan