1. Chair of Solid State and Materials Chemistry Institute of Physics University of Augsburg Universitätsstraße 1 Augsburg D‐86159 Germany
2. Pediatric Hematology and Oncology University Children's Hospital Muenster Albert‐Schweitzer‐Campus 1 Muenster D‐48149 Germany
3. First Faculty of Medicine Institute of Biophysics and Informatics Charles University Salmovská 1 Prague 120 00 Czech Republic
4. Chair of Experimental Physics IV Institute of Physics University of Augsburg Universitätsstraße 1 Augsburg D‐86159 Germany
5. Chair of Experimental Physics V Centre for Electronic Correlations and Magnetism Institute of Physics University of Augsburg Universitätsstraße 1 Augsburg D‐86159 Germany
6. Department of Diagnostic and Interventional Radiology Institute for Clinical and Experimental Medicine Vídeňská1958/9 Prague 4 140 21 Czech Republic