1. Department of NeuroradiologyUniversity Hospital Zurich Zurich Switzerland
2. Department of Radiological Sciences, College of Applied Medical SciencesKing Saud University Riyadh Saudi Arabia
3. Institute for Biomedical EngineeringUniversity and ETH Zurich Zurich Switzerland
4. Max Planck Institute for Biological Cybernetics Tubingen Germany
5. Department of RadiologySwiss Paraplegic Centre Nottwil Switzerland
6. MR CentreChildren's University Hospital Zurich Switzerland