Wellcome Trust Centre for Neuroimaging, University College London, London, United Kingdom , Centre for Functional MRI of the Brain (FMRIB), University of Oxford, Oxford, United Kingdom.|Wellcome Trust Centre for Neuroimaging, University College London, London, United Kingdom , Centre for Functional MRI of the Brain (FMRIB), University of Oxford, Oxford, United Kingdom.|Wellcome Trust Centre for Neuroimaging, University College London, London, United Kingdom , Centre for Functional MRI of the Brain (FMRIB), University of Oxford, Oxford, United Kingdom.|Wellcome Trust Centre for Neuroimaging, University College London, London, United Kingdom , Centre for Functional MRI of the Brain (FMRIB), University of Oxford, Oxford, United Kingdom.