1. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute at Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
2. State Key Laboratory of Oral Disease, West China Hospital
of Stomatology, Sichuan University, Chengdu 610041, China
3. Department of Preventive Dentistry, West China Hospital
of Stomatology, Sichuan University, Chengdu 610041, China