1. Department of Neurosurgery, Kantonsspital Aarau, 5001 Aarau, Switzerland
2. Cerebrovascular Research Group, Department for BioMedical Research, University of Bern, 3010 Bern, Switzerland
3. Experimental Surgery Facility, Department for Biomedical Research, Faculty of Medicine, University of Bern, 3010 Bern, Switzerland
4. Institute of Neuroradiology, Department of Radiology, Kantonsspital Aarau, 5001 Aarau, Switzerland