1. Federal Institute for Materials Research and Testing (BAM); Division 1.10 Biophotonics; Richard-Willstaetter-Strasse 11 12489 Berlin Germany
2. German Federal Institute for Risk Assessment (BfR); Department of Chemical and Product Safety; Max-Dohrn-Strasse 8-10 10589 Berlin Germany
3. Institute of Interventional and Diagnostic Radiology; University Medical Center Göttingen; Robert-Koch-Strasse 40 37075 Göttingen Germany
4. Department of Haematology and Medical Oncology; University Medical Center Göttingen; Robert-Koch-Strasse 40, 5. Department of Molecular Biology of Neuronal Signal; Max-Planck-Institute of Experimental Medicine; Hermann-Rein-Strasse 3 37075 Göttingen Germany