1. Department of Pathology, School of Basic Medical Science, Ningxia Medical University, Ningxia Key Laboratory of Cerebrocranial Diseases, Incubation Base of National Key Laboratory, Yinchuan, Ningxia 750004, P.R. China
2. Department of Pharmaceutical Sciences, Biomanufacturing Research Institute and Technological Enterprise, College of Health and Sciences, North Carolina Central University, Durham, NC 27707, USA