Affiliation: | a Lecturer, Department of Prosthodontics. School of Stomatology, Fourth Military Medical University (FMMU), Xi’an, China b Doctoral student, Department of Prosthodontics. School of Stomatology, Fourth Military Medical University (FMMU), Xi’an, China c Graduate student, Department of Prosthodontics. School of Stomatology, Fourth Military Medical University (FMMU), Xi’an, China d Professor and Dean, School of Stomatology. School of Stomatology, Fourth Military Medical University (FMMU), Xi’an, China |