Affiliation: | a Division of Associated Clinical Specialties, Section of Periodontics, School of Dentistry, University of California, Los Angeles, United States b Division of Associated Clinical Specialties, Section of Orthodontics, School of Dentistry, University of California, Los Angeles, United States c Division of Surgical and Diagnostic Sciences, Section of Oral Radiology, School of Dentistry, University of California, Los Angeles, United States |