1. Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
2. Department of Neurosurgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
3. Department of Neurosurgery, Tulane University, New Orleans, LA 70112, USA
4. Departments of Neurosurgery, Physiology, and Anesthesiology, Loma Linda University, School of Medicine, Loma Linda, CA 92354, USA
5. Department of Neurosurgery, University of Cincinnati, Cincinnati, OH 45219, USA
6. Department of Psychiatry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan