1. Department of Stomatology, The people' s Hospital of LinShui, Sichuang, People's Republic of China
2. Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, People's Republic of China
3. Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, People's Republic of China
4. College of Stomatology, Chongqing Medical University, Chongqing, People's Republic of China
5. School of Public Health and Management, Chongqing Medical University, Chongqing, People's Republic of China
6. Department of Stomatology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China