Affiliation: | 1.Department of Neurosurgery, University Hospital Zurich, University of Zurich, Zurich, Switzerland ;2.Department of Neurosurgery, Kantonsspital St. Gallen, St. Gallen, Switzerland ;3.Department of Neurosurgery, Hospitaux Universitaires de Geneve (HUG), Geneva, Switzerland ;4.Department of Neurosurgery, Inselspital Bern, Bern, Switzerland ;5.Department of Neurosurgery, University Clinic Basel, Basel, Switzerland ;6.Department of Neurosurgery, Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland ;7.Department of Neurosurgery, Ospedale Regionale di Lugano, Lugano, Switzerland ;8.Department of Neurosurgery, University Hospital Göttingen, Göttingen, Germany ; |