Affiliation: | 1. Department of Biomedical Engineering, School of Medicine, Yangsan, 626-770, Korea 2. Department of Conservative Dentistry, School of Dentistry, Pusan National University, Yangsan, 626-870, Korea 3. Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, 27599, USA 4. Department of Dental Materials, Biomedical Research Institute, School of Dentistry, Pusan National University, Yangsan, 626-870, Korea
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