1. Erwin L. Hahn Institute for Magnetic Resonance Imaging; University of Duisburg-Essen; Essen Germany
2. High Field and Hybrid MR Imaging, University Hospital Essen; University of Duisburg-Essen; Essen Germany
3. Department of Neurology, University Hospital Essen; University of Duisburg-Essen; Essen Germany