1. Department of Experimental Molecular Imaging, Helmholtz Institute for Biomedical Engineering, RWTH - Aachen University, Pauwelsstrasse 20, 52074 Aachen, Germany
2. Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Sorbonnelaan 16, 3584 CA Utrecht, The Netherlands
3. Department of Innovative Cancer Diagnosis and Therapy, Clinical Cooperation Unit Radiation Oncology, German Cancer Research Center, Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
4. Department of Chemistry IFM and Molecular Imaging Center, University of Torino, Via P. Giuria 7, 10125 Torino, Italy