1. Department of NeurosurgerySaarland University Medical Center and Saarland University Faculty of Medicine Homburg/Saar Germany
2. Department of NeuroradiologySaarland University Medical Center and Saarland University Faculty of Medicine Homburg/Saar Germany
3. Department of NeurosurgeryGeisinger Health System Danville Pennsylvania
4. Research Institute of NeurointerventionParacelsus Medical University Salzburg Austria