1. School
of Chinese Materia Medica, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
2. Shenyang Pharmaceutical University, Shenyang 110016, China
3. Division of Molecular
Pharmaceutics and Center for Nanotechnology in Drug Delivery, Eshelman
School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States