1. Postgraduate Program in Epidemiology, Federal University of Pelotas, Pelotas, RS, Brazil
2. Department of Genetics, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
3. Postgraduate Program in Biosciences, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brazil
4. Department of Psychiatry, Faculdade de Medicina (FMUSP), Universidade de São Paulo, São Paulo, SP, Brazil
5. Health Science Center Houston, University of Texas, Houston, Texas, United States
6. ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
7. Postgraduate Program in Psychiatry and Behavioral Sciences, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil