1. Department of Anesthesiology, Beijing Friendship Hospital, Capital Medical University, Beijing 100053, China
2. Burrell College of Osteopathic Medicine, Las Cruces, NM 88003, USA
3. Center for Neuroscience Research, School of Medicine, Loma Linda University, Loma Linda, CA 92324, USA
4. Department of Anesthesiology, Neurosurgery and Neurology, School of Medicine, Loma Linda University, Loma Linda, CA 92324, USA
5. Department of Physiology and Pharmacology, Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, CA 92324, USA