Affiliation: | 1. Section of Periodontology, Faculty of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil 2. Department of Stomatology, Faculty of Dentistry, Federal University of Santa Maria, Floriano Peixoto 1184, Santa Maria, 97015 372, Brazil 3. Department of Periodontics & Oral Biology, College of Dental Medicine, Georgia Regents University, Augusta, GA, USA
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