1. Department of Stomatology, School of Dentistry, Universidade Federal de Santa Maria, Santa Maria 97105-900, Brazil
2. Department of Health and Nursing Sciences, University of Agder, Postbox 422, N-4604 Kristiansand, Norway
3. Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Universidade de São Paulo, São Paulo 05508-000, Brazil