1. Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg D-85764, Germany
2. Chair of Biological Imaging at the Central Institute for Translational Cancer Research (TranslaTUM), School of Medicine, Technical University of Munich, Munich D-81675, Germany
3. Munich Institute of Biomedical Engineering (MIBE), Technical University of Munich, Garching b., München D-85748, Germany