1 Department of Neurosurgery Highly Specialized Hospital and of National Importance "Garibaldi" Catania, Italy.
2 Department of Neurosurgery Cannizzaro Hospital Trauma Center Gamma Knife Center Catania, Italy.
3 Experimental Biomedicine and Clinical Neurosciences School of Medicine Postgraduate Residency Program in Neurological Surgery Neurosurgical Clinic AOUP "Paolo Giaccone" Palermo, Italy.
4 Department of Neurological Surgery Christian Doppler Klinik Paracelsus Medical University Salzburg, Austria.
5 Laboratory for Microsurgical Neuroanatomy Christian Doppler Klinik Salzburg, Austria.