1. Physikalisch-Technische Bundesanstalt (PTB); Braunschweig and Berlin Germany
2. Center for Medical Physics and Biomedical Engineering; Medical University of Vienna; Vienna Austria
3. MR Center of Excellence; Medical University of Vienna; Vienna Austria
4. Department of Biomedical Magnetic Resonance; Institute for Experimental Physics, Otto-von-Guericke-University; Magdeburg Germany