1. Department of Stomatology Postgraduate Program in Dentistry; Emphasis on Periodontics, Universidade Federal de Santa Maria (UFSM) Santa Maria Brazil
2. Department of Semiology and General Dentistry Periodontics, School of Dentistry, Universidade Federal de Pelotas – UFPel Pelotas Brazil
3. Department of Comprehensive Oral Health – Periodontology Adams School of Dentistry, The University of North Carolina Chapel Hill North Carolina USA