1. Department of Pediatrics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
2. Department of Pediatrics, Faculty of Medicine, University of São Paulo, São Paulo, Brazil
3. Department of Public Health, University of Maranhão, São Luis, Brazil
4. Department of Pediatrics, Faculty of Medicine, Federal University of Rio Grande do Sul, Porto Alegre, Brazil