1. Engineering Research Center in Biomaterials, Sichuan University, Chengdu 610065, Sichuan, P. R. China
2. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, Sichuan, P. R. China
3. Metrology Research Centre, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
4. Laboratory of Ethnopharmacology, West China School of Medicine, Sichuan University, Chengdu 610065, Sichuan, P. R. China
5. State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, Sichuan, P. R. China