1. Engineering Research Center in Biomaterials, Sichuan University, Chengdu, Sichuan 610065, P. R. China
2. Laboratory of Ethnopharmacology, Tissue-orientated Property of Chinese Medicine Key Laboratory of Sichuan Province, West China School of Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610065, P. R. China
3. College of Chemical Engineering, Sichuan University, Chengdu, Sichuan 610065, P. R. China
4. Metrology Research Centre, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
5. Analytical & Testing Center, Sichuan University, Chengdu, Sichuan 610065, P. R. China
6. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan 610065, P. R. China