1. Central Laboratory, Peking University School and Hospital of Stomatology and National Center of Stomatology and National Clinical Research Center for Oral Diseases and National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, PR China
2. Shanxi Medical University School and Hospital of Stomatology, Taiyuan, PR China
3. Institute of Microbiology, Chinese Academy of Sciences, Beijing, PR China
4. China General Microbiological Culture Collection Center, Institute of Microbiology, Chinese Academy of Sciences, Beijing, PR China