1. Department of Periodontology, Universidad San Martin de Porres, Lima, Peru.
2. Department of Periodontology, Universidad de Monterrey, Monterrey, Mexico.
3. Department of Periodontology, School of Dentistry, Universidad Cientifica del Sur, Lima, Peru.
4. Department of Periodontology, Dental Research Division, Guarulhos University, Guarulhos, Brazil.
5. Division of Periodontics, Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.