Affiliation: | 1. Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA;2. Department of Periodontics, Faculty of Dentistry, Najran University, Najran, Saudi Arabia;3. Department of Periodontics, State University of Campinas, Piracicaba, Brazil;4. School of Dentistry, Federal University of Minas Gerais, Brazil;5. State Key Laboratory of Oral Disease, West China Hospital of Stomatology Sichuan University, Chengdu, Sichuan, China |