1 Neurosurgery Department, University Hospital Zurich, Zurich, Switzerland; Clinical Neuroscience Center, University of Zurich, Zurich, Switzerland. Electronic address: giuseppe.esposito@usz.ch.
2 Neurosurgery Department, University Hospital Zurich, Zurich, Switzerland; Clinical Neuroscience Center, University of Zurich, Zurich, Switzerland; Department of Spine-Surgery, Neurosurgery and Orthopaedic, Schulthess Clinic, Zurich, Switzerland.
3 Neurosurgery Department, University Hospital Zurich, Zurich, Switzerland; Clinical Neuroscience Center, University of Zurich, Zurich, Switzerland.