1. Department of Surgery, Kaohsiung Municipal Hsiao-Kang Hospital, Kaohsiung, Taiwan
2. Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Taiwan
3. Department of Neurosurgery, Kaohsiung Medical University Hospital, 100 Shih-Chuan First Road, Kaohsiung, Taiwan
4. Department of Pathology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
5. Department of Surgery, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
6. Department of Neurosurgery, University of Virginia, Charlottesville, VA, USA
7. Department of Pathology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan