1. School of Pharmacy, Ningxia Medical University, Yinchuan, Ningxia, China,
2. Ningxia Engineering and Technology Research Center for Modernization of Hui Medicine & Key Lab of Hui Ethnic Medicine Modernization, Ministry of Education, Yinchuan, Ningxia, China,
3. Departments of Biomedical Engineering and Pharmaceutics, Purdue University, West Lafayette, IN, USA, and
4. Department of Pharmaceutics, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, China