1. Department of Neurosurgery, Neurological Institute, Taichung Veterans General Hospital, Taichung 40201, Taiwan
2. Department of Neurosurgery, Chung Shan Medical University Hospital, No. 110, Section 1, Jianguo North Road, Taichung 40201, Taiwan
3. Department of Medical Imaging, Chung Shan Medical University Hospital, Taichung 40201, Taiwan