1. Key Lab. of Oral Diseases Research of Anhui Province College & Hospital of Stomatology Hefei Anhui 230032 P. R. China
2. Department of Epidemiology and Biostatistics School of Public Health Anhui Medical University Hefei Anhui 230032 P. R. China
3. School of Stomatology Anhui Medical University Hefei Anhui 230032 P. R. China
4. Inflammation and Immune Mediated Diseases Laboratory of Anhui Province Hefei Anhui 230032 P. R. China
5. School of Pharmacy Anhui Key Lab. of Bioactivity of Natural Products Anhui Medical University Hefei Anhui 230032 P. R. China
6. Department of Periodontology Anhui Stomatology Hospital affiliated to Anhui Medical University Hefei Anhui 230032 P. R. China