1. Department of Stomatology, Postgraduate Program in Dentistry, Santa Maria, Rio Grande do Sul, Brazil
2. Emphasis on Periodontics, Universidade Federal de Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
3. Graduate Dentistry Program, Federal University of Maranhão, São Luís, Maranhão, Brazil
4. Emphasis on Endodontics, Universidade Federal de Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil
5. Institute of Health Services Research in Dentistry, University of Münster, Münster, Germany
6. Graduate Program in Dentistry, Universidade Federal de Pelotas (UFPel), Pelotas, Rio Grande do Sul, Brazil
7. Graduate Program in Epidemiology, Universidade Federal de Pelotas (UFPel), Pelotas, Rio Grande do Sul, Brazil
8. National Dental Research Institute Singapore, National Dental Centre Singapore, Singapore
9. Oral Health Academic Programme, Duke-NUS Medical School, Singapore