1. Institute of Atomic and Molecular Physics, Sichuan University, 610065 Sichuan, P. R. China
2. Laboratory of Ethnopharmacology, West China School of Medicine, West China Hospital, Sichuan University, 610065 Sichuan, P. R. China
3. Engineering Research Center in Biomaterials, Sichuan University, 610065 Sichuan, P. R. China