1 From the Department of Psychological Medicine, The Children's Hospital at Westmead, Westmead, New South Wales, Australia (Drs. Chandra and Kozlowska, and Ms. Cruz); Disciplines of Psychiatry and of Paediatrics and Child Health, University of Sydney Medical School (Dr. Kozlowska); Brain Dynamics Centre, Westmead Millennium Institute for Medical Research, Westmead, New South Wales, Australia (Dr. Kozlowska); Harvard Medical School (Drs. Baslet and Perez); Department of Psychiatry, Brigham and Women's Hospital, Boston, MA (Dr. Baslet); Department of Psychiatry, Massachusetts General Hospital, Boston, MA (Dr. Perez); Imperial College London (Dr. Garralda).