1. School and Hospital of Stomatology, Fujian Medical University, Fuzhou, Fujian 350000, P.R. China
2. Engineering Research Center of Stomatological Biomaterials, Fujian Province University, Xiamen Medical College, Xiamen, Fujian 361023, P.R. China
3. Department of Stomatology, Xiamen Medical College, Xiamen, Fujian 361023, P.R. China
4. Department of Stomatology, Affiliated Hospital of Putian University, Putian, Fujian 351100, P.R. China