1. Neurophysiology Laboratory, Neurosurgical Service, Department of Surgery, National Cheng Kung University Medical Center and Medical School, Tainan, Taiwan
2. Institute of Pharmacy, China Medical University, Taichung, Taiwan
3. Department of Anesthesiology, Buddhist Tzu‐Chi University and Buddhist Tzu Chi General Hospital, Hualien, Taiwan
4. Department of Chemistry, National Cheng Kung University, Tainan, Taiwan