1. Ningxia Key Laboratory of Cerebrocranial Diseases, Ningxia Medical University, Yinchuan, Ningxia Hui 750004, P.R. China
2. Basic Medical School of Ningxia Medical University, Yinchuan, Ningxia Hui 750004, P.R. China
3. School of Pharmacy, Ningxia Medical University, Yinchuan, Ningxia Hui 750004, P.R. China