1. The State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
2. Department of Geriatric Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China
3. Department of Molecular Microbiology and Immunology, Oregon Health and Science University, Portland, OR, USA
4. Department of Community Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, USA
5. School of Public Health, Oregon Health & Science University, Portland, OR, USA
6. Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
7. Department of Restorative Dentistry, Oregon Health and Science University, Portland, OR, USA