1. Neuropsychopharmacology Unit, Division of Experimental Medicine, Imperial College London, Burlington Danes Building; Du Cane Road London United Kingdom
2. Neurobiology Research Unit and Center for Integrated Molecular Brain Imaging, Rigshospitalet and University of Copenhagen, Blegdamsvej 9; DK-2100 Copenhagen Denmark
3. Molecular Imaging Branch, National Institute of Mental Health; National Institutes of Health; Bethesda Maryland