1 Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Portugal. Electronic address: diana.prata@medicina.ulisboa.pt.
2 King's College London, Department of Neuroimaging, Institute of Psychiatry, Psychology and Neuroscience, UK.
3 Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Portugal; Kings College London, Department of Neuroimaging, Institute of Psychiatry, Psychology and Neuroscience, De Crespigny Park, London SE5 8AF, UK.