1. Institute of Inorganic Chemistry, University of Cologne, Greinstrasse 6, 50939 Cologne, Germany
2. Clinic and Polyclinic for Nuclear Medicine, University of Cologne, Kerpenerstrasse 62, 50937 Cologne, Germany
3. Cologne Center for Genomics (CCG), University of Cologne, Faculty of Medicine and University Hospital Cologne, 50931 Cologne, Germany
4. Center for Biochemistry, Medical Faculty, University of Cologne, 50931 Cologne, Germany
5. Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Strasse 40, 01187 Dresden, Germany
6. Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, Blindern, 0315 Oslo, Norway