1. Department of Neurosurgery, Hospital Nacional Guillermo Almenara, Lima, Peru,
2. Department of Ophthalmology, Hospital Nacional Guillermo Almenara, Lima, Peru,
3. Department of Neurosurgery, School of Biomedical Sciences, Universidad Austral, Buenos Aires, Argentina,
4. Department of Neurosurgery, Mater Dei Hospital, Bari, Italy
5. Department of Neurosurgery, Azienda Ospedaliera Universitaria Pisana, University of Pisa, Pisa, Italy.