1 Neurosurgical Service, Centre Hospitalier Universitaire Vaudois (CHUV), CHUV Rue du Bugnon 46, 1011 Lausanne, Switzerland.
2 Faculty of Biology and Medicine, University of Lausanne, CHUV Rue du Bugnon 46, 1011 Lausanne, Switzerland; Thoracic Surgery Service, Centre Hospitalier Universitaire Vaudois (CHUV), CHUV Rue du Bugnon 46, 1011 Lausanne, Switzerland.
3 Neurosurgical Service, Centre Hospitalier Universitaire Vaudois (CHUV), CHUV Rue du Bugnon 46, 1011 Lausanne, Switzerland; Faculty of Biology and Medicine, University of Lausanne, CHUV Rue du Bugnon 46, 1011 Lausanne, Switzerland.