Affiliation: | 1. Department of Periodontics and Community Dentistry, College of Dentistry, King Saud University, Riyadh, Saudi Arabia;2. Department of Periodontology, Tufts University School of Dental Medicine, Boston, Massachusetts, USA;3. Department of Comprehensive Care, Tufts University School of Dental Medicine, Boston, Massachusetts, USA;4. Department of Public Health and Community Service, Tufts University School of Dental Medicine, Boston, Massachusetts, USA |