1. 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
2. National Engineering Research Center for Biomaterials College of Biomedical Engineering Sichuan University Chengdu Sichuan, 610065 P. R. China
3. Metrology Research Centre National Research Council Canada Ontario K1A 0R6 Canada
4. Institute of Atomic and Molecular Physics Sichuan University Chengdu Sichuan, 610065 P. R. China