1. Postgraduate Program of Dentistry Federal University of Maranhão São Luís Brazil
2. Section of Periodontology, Department of Dentistry and Oral Health Aarhus University Aarhus Denmark
3. Department of Pediatric Dentistry of Ribeirão Preto University of São Paulo São Paulo Brazil
4. Faculty of Dentistry University of British Columbia Vancouver British Columbia Canada
5. Postgraduate Program of Public Health Federal University of Maranhão São Luís Brazil