1. Graduate Program in Dentistry; Federal University of Pelotas; Pelotas Brazil
2. Section of Periodontology; Department of Dentistry and Oral Health; Aarhus University; Aarhus Denmark
3. Australian Research Centre for Population Oral Health; Adelaide SA Australia
4. Postgraduate Program in Epidemiology; Federal University of Pelotas; Pelotas Brazil
5. Department of Preventive Medicine; Faculty of Medicine; University of São Paulo; São Paulo Brazil