1. Kantonsspital Luzern, Switzerland
2. Department of Diagnostic and Interventional Neuroradiology, Inselspital, University of Bern, Switzerland
3. Institute of Pathology, University of Bern, Switzerland
4. Department of Neurology, Inselspital, University of Bern, Switzerland
5. Department of Neurosurgery, Inselspital, University of Bern, Switzerland; and Stadtspitäler Triemli und Waid, Zurich, Switzerland / Neurosurgery, Neurocenter of Southern Switzerland, EOC, Lugano, Switzerland