1. Large Animal Clinic for Surgery, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany.
2. Department of Surgery and Anaesthesia, Faculty of Veterinary Medicine, University of Khartoum, Shambat, Sudan.
3. Microsurgery and Animal Models Core, Translational Centre for Regenerative Medicine, University of Leipzig, Leipzig, Germany.
4. Department of Neurosurgery, BG Hospital Bergmannstrost, Halle, Germany.