1. Department of Preventive and Restorative Dental Sciences; University of California San Francisco School of Dentistry; San Francisco CA USA
2. Division of Epidemiology; School of Public Health; University of California Berkeley; Berkeley CA USA
3. Department of Pediatric Dentistry; Universidade Luterana do Brasil; Canoas Brazil
4. Graduate Program in Health Sciences; Universidade Federal de Ciências da Saúde de Porto Alegre; Porto Alegre Brazil