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Department of General Dentistry, Peking University School and Hospital of Stomatology
& National Center of Stomatology & National Clinical Research Center for Oral Diseases
& National Engineering Laboratory for Digital and Material Technology of Stomatology
& Beijing Key Laboratory of Digital Stomatology & NHC Research Center of Engineering
and Technology for Computerized Dentistry & NMPA Key Laboratory for Dental Materials,
Beijing 100081, China.