1Neurosurgery, National Neuroscience Institute, Singapore, Singapore, 2Neurosurgery, University of Cambridge, Cambridge, United Kingdom, 3SDA Bocconi School of Management, Milan, Italy, 4Neurosurgical Division, Dept of Clinical Neurosciences, University of Cambridge Hospitals NHS Foundation Trust, Cambridge, United Kingdom, 5Dept of Psychiatry, Yale University School of Medicine, New Haven, CT, United States, 6Department of Psychiatry and MRC/Wellcome Trust Behavioural and Clinical Neuroscience Institute, University of Cambridge, Cambridge, United Kingdom, 7Department of Radiology, University of Cambridge, Cambridge, United Kingdom