1. Max Planck Institute for Biological Cybernetics; Tuebingen Germany
2. IMPRS for Cognitive and Systems Neuroscience, University of Tuebingen; Tuebingen Germany
3. Skope Magnetic Resonance Technologies AG; Zurich Switzerland
4. Institute of Physics; Ernst-Moritz-Arndt University; Greifswald Germany
5. Department of Biomedical Magnetic Resonance; University of Tuebingen; Tuebingen Germany