1. Institute for Radiology, Nuclear Medicine and Molecular Imaging, Heart and Diabetes Center North, Rhine Westphalia, University Hospital, Ruhr University Bochum, Georgstr. 11, D-32545 Bad Oeynhausen, Germany
2. Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Münster, Corrensstr. 40, D-48149 Münster, Germany
3. ‘Cells in Motion’ Cluster of Excellence, University of Münster, Waldeyerstr. 15, D-48149 Münster, Germany