1. University of Halle-Wittenberg, Department of Neurosurgery, Halle (Saale), Germany
2. Analytisches Zentrum Biopharm GmbH Berlin, Bioanalytics, Berlin, Germany
3. University of Halle-Wittenberg, Institue for Medical Epidemilogy, Halle, Germany
4. Institute of Pharmacology and Toxicology, University of Halle-Wittenberg, Halle, Germany
5. University Halle-Wittenberg, Oral and Maxillofacial Plastic Surgery, Halle, Germany