1. Institute of Veterinary Anatomy, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
2. Department of Morphology, Faculty of Veterinary Medicine, Ghent University, Ghent, Belgium
3. Institute of Veterinary Anatomy, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
4. Berlin-Brandenburg Centre for Regenerative Therapies, Institute of Polymer Research, GKSS Research Centre Geesthacht, Teltow, Germany