1. Department of Anesthesia; University Hospital Virgen de la Arrixaca; Murcia Spain
2. Department of Ophthalmology and Optometry; School of Medicine; University of Murcia; Murcia Spain
3. Department of Ophthalmology; General University Hospital Reina Sofia; Murcia Spain
4. Department of Neurosurgery; University Hospital Virgen de la Arrixaca; Murcia Spain