1. Peking University School and Hospital of Stomatology & National Center for 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, Beijing 100081, China; 2. Beijing Laboratory of Oral Health, Capital Medical Unirersity, Beijing 100069, China; 3. Department of VIP Dental Service, Beijing Stomatological Hospital, Capital Medical University, Beijing 100050, China; 4. School of Health Humanities, Peking University, Beijing 100191, China