1. Neurosurgery Department, University Hospital Duesseldorf, Duesseldorf, Germany
2. Institute of Complex Systems (ICS-6) Structural Biochemistry, Forschungszentrum Juelich, Juelich, Germany
3. Institute for Stem Cell Research and Regenerative Medicine, Medical Faculty, Heinrich-Heine-University Duesseldorf, Duesseldorf, Germany
4. Institut für Physikalische Biologie, Heinrich-Heine-University Duesseldorf, Duesseldorf, Germany
5. Neurosurgery and Pediatric Neurosurgery, Medical University Lublin, Lublin, Poland