1. Department of Neurosurgery Charité–Universitätsmedizin Berlin, corporate member of Free University of Berlin, Humboldt University of Berlin, and Berlin Institute of Health Berlin Germany
2. Department of Biometry and Clinical Epidemiology Charité–Universitätsmedizin Berlin, corporate member of Free University of Berlin, Humboldt University of Berlin, and Berlin Institute of Health Berlin Germany
3. Vertebral Spine Center Berlin Berlin Germany