1. Department of Neurosurgery, Helios Klinikum Erfurt, Erfurt, Germany
2. Department of Neurosurgery, Universitätsmedizin Göttingen, Göttingen, Germany
3. Department of Neuroradiology, HELIOS Klinikum Erfurt, Erfurt, Thüringen, Germany
4. Department of Neurology, HELIOS Klinikum Erfurt, Erfurt, Thüringen, Germany