1 Psychiatry, University of Cambridge, Cambridge, United Kingdom.
2 Orygen, The National Centre of Excellence in Youth Mental Health, Parkville, Australia; Centre for Youth Mental Health, The University of Melbourne, Melbourne, Australia.
3 Psychiatry, Radiology and Biomedical Imaging, and the Child Study Center, Yale School of Medicine, New Haven, USA. Electronic address: hilary.blumberg@yale.edu.