1. First Clinical Division, Peking University Hospital of Stomatology, Beijing, China
2. Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, China
3. Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
4. National Center for Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
5. National Clinical Research Center for Oral Diseases, Peking University School and Hospital of Stomatology, Beijing, China
6. National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Peking University School and Hospital of Stomatology, Beijing, China