1. Department of Neurosurgery, Chung Shan Medical University Hospital, Taichung 40201, Taiwan
2. Department of Neurosurgery, Neurological Institute, Taichung Veterans General Hospital, Taichung 40705, Taiwan
3. Department of Anatomical Pathology, Chung Shan Medical University Hospital, Taichung 40201, Taiwan
4. School of Medicine, College of Medicine, Chung Shan Medical University, Taichung 40201, Taiwan