1. High-Field Magnetic Resonance Center, Max Planck Institute for Biological Cybernetics; Tübingen Germany
2. Center for Magnetic Resonance Research; Department of Radiology; University of Minnesota Medical School; Minneapolis Minnesota USA
3. Department of Biomedical Magnetic Resonance; University of Tübingen; Tübingen Germany
4. Maastricht Brain Imaging Center (M-BIC); Department of Cognitive Neuroscience; Faculty of Psychology and Neuroscience; Maastricht University; Maastricht The Netherlands