1 Service de Neurologie, Département des Neurosciences Cliniques, Centre Hospitalier Universitaire Vaudois (CHUV), CH1011 Lausanne, Switzerland. Electronic address: arseny.sokolov@chuv.ch.
2 Service de Neurochirurgie, Département des Neurosciences Cliniques, Hôpitaux Universitaires de Genève (HUG), Geneva, Switzerland.
3 Department of Neuroradiology, Clinical Neuroscience Center, University Hospital of Zurich, Zurich, Switzerland.
4 Department of Neurology, University Hospital of Bern (Inselspital), Bern, Switzerland.