1. Department of Pharmaceutics and Bioengineering, School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
2. Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, P. R. China
3. Department of Periodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, P. R. China
4. People’s Hospital of Lanshan District, Linyi 27600, P. R. China