1. Madrid, Spain
2. From the Department of Neurosurgery, Hospital Universitario Ramon y Cajal, Madrid, Spain, Hospital Ruber Internacional
3. From the Department of Otolaryngology, Hospital Ruber Internacional
4. Department of Pathology, Hospital Universitario Doce de Octubre, Madrid, Spain
5. Department of Neuroradiology, Hospital Ruber Internacional
6. Department of Ophthalmology Units, Hospital Ruber Internacional