1. Center for Medical Basic Research, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany
2. Faculty of Veterinary Medicine, Institute of Veterinary Anatomy, Freie Universität Berlin, Berlin, Germany
3. Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies, Helmholtz-Zentrum Geesthacht, Teltow, Germany
4. Department of Radiology, Charité-University Medicine Berlin, Berlin, Germany