1 Department of Nuclear Medicine, University Hospital Münster, Albert-Schweitzer-Campus 1, Building A1, Münster, 48149, Germany. vrachal@uni-muenster.de.
2 Department of Nuclear Medicine, University Hospital Münster, Albert-Schweitzer-Campus 1, Building A1, Münster, 48149, Germany.
3 European Institute for Molecular Imaging-EIMI, University of Münster, Münster, Germany.
4 DFG Cluster of Excellence EXC 1003 'Cells in Motion', University of Münster, Münster, Germany.