1. Department of Neurosurgery, Chang Gung Memorial Hospital and University, Taoyuan, Taiwan
2. Department of Neurosurgery, Kaohsiung Medical University, Kaohsiung, Taiwan
3. Department of Anesthesiology, Chang Gung Memorial Hospital and University, Taoyuan, Taiwan
4. Department of Chest, Chang Gung Memorial Hospital and University, Taoyuan, Taiwan