1. Departamento de Psiquiatria da Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, Brazil.
2. Funding: No funding was received for this article.
3. Department of Psychiatry, Yale University, New Haven, Connecticut, USA.
4. Yale Child Study Center, New Haven, Connecticut, USA.
5. Child and Adolescent OCD, Tic, Trich and Anxiety Group (COTTAGe), Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
6. Department of Psychiatry and Behavioral Neuroscience, University of Chicago, Chicago, Illinois, USA.
7. Department of Pediatrics, University of South Florida, Tampa, Florida, USA.
8. Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
9. Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, Texas, USA.
10. Institute of Living, Hartford, Connecticut, USA.
11. Yale University School of Medicine, New Haven, Connecticut, USA.