1. Clinic for Persons with Disabilities; Seoul National University Dental Hospital; Dental Research Institute; School of Dentistry; Seoul National University; Seoul Korea
2. Department of Dental Ecology; School of Dentistry; University of North Carolina; Chapel Hill NC USA
3. Department of Dental Laboratory Science and Engineering; College of Health Science and Department of Public Health Sciences; Graduate School & BK21 + Program in Public Health Sciences; Korea University; Seoul Korea