1. UCL Huntington's Disease Centre, Institute of Neurology, University College London; London United Kingdom
2. Max Planck Institute for Human Cognitive and Brain Sciences; Leipzig Germany
3. Wellcome Trust Centre for Neuroimaging; Institute of Neurology, University College London; London United Kingdom
4. Carver College of Medicine; University of Iowa; Iowa City Iowa
5. George Huntington Institute and Department of Radiology; University of Muenster; Münster Germany
6. Section for Neurodegeneration and Hertie Institute for Clinical Brain Research, University of Tuebingen; Tübingen Germany
7. Institute of Cognitive Neuroscience, University College London; London United Kingdom