Department of Psychiatry and Behavioral Sciences, State University of New York Upstate Medical University, Syracuse, NY 13210

Department of Neuroscience and Physiology, State University of New York Upstate Medical University, Syracuse, New York

Clinical and Research Programs in Pediatric Psychopharmacology and Adult ADHD, Massachusetts General Hospital, Boston, Massachusetts, USA

K.G. Jebsen Centre for Psychiatric Disorders, Department of Biomedicine, University of Bergen, Bergen, Norway

Departments of Psychiatry and of Neuroscience and Physiology, SUNY Upstate Medical Center, Syracuse, NY, USA

Department of Psychiatry and of Neuroscience and Physiology, State University of New York (SUNY) Upstate Medical University, Syracuse, NY, United States

The full list of authors in the ENIGMA working groups, author affiliations, author disclosures, and acknowledgments are provided in online supplements.

Departments of Psychiatry and Neuroscience and Physiology, SUNY Upstate Medical University, New York, USA

The Department of Human Genetics, Donders Institute for Brain, Cognition, and Behavior, Radboud University Medical Center, Nijmegen, the Netherlands (Klein, Bralten, Roth Mota, Arias-Vasquez, Franke); University Medical Center Utrecht, UMC Utrecht Brain Center, Department of Psychiatry, Utrecht, the Netherlands (Klein); the Analytic and Translational Genetics Unit, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston (Walters, Neale); Program in Medical and Population Genetics (Walters) and Stanley Center for Psychiatric Research, Broad Institute of Harvard and MIT, Cambridge, Mass (Walters, Neale); the Department of Biomedicine and the Center for Integrative Sequencing, Aarhus University, Aarhus, Denmark (Demontis, Mattheisen, Børglum); the Lundbeck Foundation Initiative for Integrative Psychiatric Research (iPSYCH), Denmark (Demontis, Børglum); the Department of Genetics and the Neuroscience Center, University of North Carolina, Chapel Hill (Stein); the Imaging Genetics Center, USC Mark and Mary Stevens Neuroimaging and Informatics Institute, Keck School of Medicine, University of Southern California, Los Angeles (Hibar, Thompson); the Department of Epidemiology and the Department of Radiology and Nuclear Medicine, Erasmus Medical Center, Rotterdam, the Netherlands (Adams); the Department of Psychiatry and the Research Institute, Hospital for Sick Children, University of Toronto, Toronto (Schachar); the Department of Child and Adolescent Psychiatry, Institute of Psychiatry, Psychology, and Neuroscience, King's College London (Sonuga-Barke); the Department of Psychiatry, Psychosomatics and Psychotherapy, University of Wuerzburg, Wuerzburg, Germany (Mattheisen); the Department of Clinical Neuroscience, Center for Psychiatric Research, Karolinska Institute, Stockholm (Mattheisen); Stockholm Health Care Services, Stockholm County Council, Stockholm (Mattheisen); the Department of Neurology, Keck School of Medicine, University of Southern California, Los Angeles (Thompson); the Quantitative Genetics Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia (Medland); the Department of Psychiatry and the Department of Neuroscience and Physiology, SUNY Upstate Medical University, Syracuse, N.Y. (Faraone); the K.G. Jebsen Center for Neuropsychiatric Disorders, University of Bergen, Bergen, Norway (Faraone); and the Department of Psychiatry, Donders Institute for Brain, Cognition, and Behavior, Radboud University Medical Center, Nijmegen, the Netherlands (Roth Mota, Arias-Vasquez, Franke).

Department of Psychiatry, Upstate Medical University, Syracuse, New York; Department of Neuroscience and Physiology, Upstate Medical University, Syracuse, New York.

SUNY Upstate Medical University, Syracuse, NY