Department of Neurosurgery, Medical University of Innsbruck, Innsbruck, Austria

Department of Neurosurgery and Neuroscience Institute, Geisinger, Danville, Pennsylvania

Research Institute of Neurointervention, Paracelsus Medical University, Salzburg, Austria

Correspondence: Christoph J. Griessenauer, MD, Department of Neurosurgery, 100 N Academy Ave, Danville, PA 17822, USA. Email: [email protected]