1. Dental Research Division, Department of Periodontology, School of Dentistry Veiga de Almeida University Rio de Janeiro Brazil
2. Department of Oral Surgery, Dentistry School Fluminense Federal University, Niterói Rio de Janeiro Brazil
3. Department of Periodontology, School of Dental Medicine University of Bern Bern Switzerland
4. Department of Periodontology School of Dentistry Tufts University Boston USA
5. Dental Research Division, Department of Periodontology and Oral Implantology University of Guarulhos São Paulo Brazil