1. State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, Sichuan, China
2. Sichuan University West China College of Stomatology, Chengdu, Sichuan, China
3. Department of Preventive Dentistry, Academic Center for Dentistry Amsterdam, University of Amsterdam, and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
4. Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China