1 Cynthia H.Y. Fu, School of Psychology, University of East London, Stratford Campus, Water Lane, London E15 4LZ, UK. Email: c.fu@uel.ac.uk, and Centre for Affective Disorders, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK; Rebecca MacGregor Legge, Centre for Affective Disorders, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK; Sarah Cohen-Woods, Discipline of Psychiatry, School of Medicine, University of Adelaide, Adelaide, Australia; James H. Cole, Computational, Cognitive and Clinical Neuroimaging Laboratory, Department of Medicine, Imperial College London, UK; Katherine J. Aitchison, Department of Psychiatry, University of Alberta, Edmonton, Canada; Peter McGuffin, MRC Social, Genetic and Developmental Psychiatry Research Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK.