1. Post Graduation Program in Dentistry; School of Dentistry; Federal University of Pelotas; Pelotas Brazil
2. Post graduation program in Epidemiology; Federal University of Pelotas; Pelotas Brazil
3. Department of Cariology; Restorative Sciences and Endodontics; School of Dentistry; University of Michigan; Ann Arbor MI USA
4. Department of Oral Surgery and Orthopedics; Pediatric Dentistry; Federal University of Rio Grande do Sul; Porto Alegre Brazil
5. Department of Semiology and Clinics; Federal University of Pelotas; Pelotas Brazil