1. Department of Pediatric Dentistry Universidade Luterana do Brasil Canoas Brazil
2. Division of Oral Epidemiology and Dental Public Health University of California San Francisco San Francisco California USA
3. Department of Pediatric Dentistry Pontifícia Universidade Católica do Rio Grande do Sul Porto Alegre Brazil
4. Department of Stomatology School of Dentistry Universidade Federal de Santa Maria Santa Maria Brazil