1. Division of Neurosurgery, Department of Surgery, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan
2. Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
3. Department of Neurosurgery, Chung Shan Medical University Hospital, Taichung, Taiwan
4. Department of Neurosurgery, Chang Gung Memorial Hospital-Chiayi, Chang Gung University College of Medicine, Tao-Yuan, Taiwan
5. Department of Pathology, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan
6. Department of Mechanical Engineering, Chang Gung University, Tao-Yuan, Taiwan
7. Department of Orthopedics, Chang Gung Memorial Hospital, Tao-Yuan, Taiwan