[1] University College London,Clinical Psychopharmacology Unit
[2] Hammersmith Hospital,Imanova Ltd, Burlington Danes Building, Imperial College London
[3] Imperial College London,Division of Brain Sciences
[4] Hammersmith Hospital,Psychiatric Imaging Group, Medical Research Council Clinical Sciences Centre
[5] University College London,Division of Psychiatry
[6] University of Exeter,Psychopharmacology and Addiction Research Centre
[7] Imperial College London,Neuropsychopharmacology Unit, Division of Experimental Medicine