Affiliation: | a Department of Periodontology and Oral Medicine, School of Stomatology, The Fourth Military Medical University, No. 145 West Changle Road, Xi’an 710032, China b Department of Orthodontics, School of Stomatology, The Fourth Military Medical University, No. 145 West Changle Road, Xi’an 710032, China c Department of Prosthetic Dentistry, School of Stomatology, The Fourth Military Medical University, No. 145 West Changle Road, Xi’an 710032, China d Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China |