1. College of Pharmaceutical Sciences, Guizhou University of Traditional Chinese Medicine, Huaxi University Town, Dongqing South Road, Guiyang 550025, Guizhou, China
2. Nano-drug Technology Research Center at Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
3. National Engineering Research Center for Biomaterials, Sichuan University, Chengdu, Sichuan 610064, P. R. China