1. Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Haidian District, Beijing, China.
2. The Central Laboratory, Peking University School and Hospital of Stomatology, Beijing, China.