1. State Key Laboratory of Supramolecular Structure and Materials
2. College of Chemistry
3. Jilin University
4. Changchun
5. P. R. China
6. Department of Periodontology
7. School and Hospital of Stomatology
8. Changchun 130021
9. Department of Oral Pathology
10. Department of Geriatric Stomatology
11. Liaoning Province Key Laboratory of Oral Disease
12. China Medical University
13. Shenyang