1. Section on Negative Affect and Social Processes, Department of Psychiatry and Legal Medicine Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul Porto Alegre Brazil
2. National Institute of Developmental Psychiatry (INPD, CNPq) São Paulo Brazil
3. Department of Neuropsychiatry Universidade Federal de Santa Maria (UFSM) Santa Maria Brazil
4. Care Policy and Evaluation Centre London School of Economics and Political Science London UK
5. Research Institute Hospital for Sick Children Toronto ON Canada
6. Centre Hospitalier Universitaire Sainte‐Justine University of Montreal Montreal QC Canada
7. Department of Morphology and Genetics Universidade Federal de São Paulo São Paulo Brazil
8. Department of Psychiatry Universidade Federal de São Paulo (UNIFESP) São Paulo Brazil
9. Universidade de São Paulo (USP) São Paulo Brazil
10. Institute of Medical Science University of Toronto Toronto ON Canada
11. Department of Physiology University of Toronto Toronto ON Canada
12. Department of Nutritional Sciences University of Toronto Toronto ON Canada
13. Division of Psychological Medicine and Clinical Neurosciences and MRC Centre for Neuropsychiatric Genetics and Genomics Cardiff University Cardiff UK
14. Psychiatric and Neurodevelopmental Genetics Unit, Center for Genomic Medicine Massachusetts General Hospital Boston MA USA
15. ECOGENE‐21 Chicoutimi QC Canada
16. ADHD Outpatient Program, Department of Psychiatry, Clinical Research Center, Hospital de Clínicas de Porto Alegre Federal University of Rio Grande do Sul Porto Alegre Brazil
17. Department of Microbiology New York University School of Medicine New York NY USA
18. Department of Psychology University of Toronto Toronto ON Canada
19. Department of Psychiatry University of Toronto Toronto ON Canada
20. Department of Psychiatry, Faculty of Medicine University of Montreal Montreal QC Canada