1. Department of NeurosurgeryHospital Clinic, Faculty of Medicine, Universitat de BarcelonaBarcelona Spain
2. Department of Human Anatomy and EmbryologyFaculty of Medicine, Universitat de BarcelonaBarcelona Spain
3. Division of NeurosurgeryDepartment of NeurosciencesReproductive and Odontostomatological SciencesUniversità degli Studi di Napoli Federico IINaples Italy