1 Department of Neurosurgery; Department of Basic Sciences, Division of Physiology, Loma Linda University, Loma Linda, CA 92354, USA. Electronic address: lhuang@llu.edu.
2 Department of Basic Sciences, Division of Physiology; Department of Neurosurgery Loma Linda University, Loma Linda, CA 92350, USA. Electronic address: jhzhang@llu.edu.