1. Department of Neurosurgery, Stanford University, Stanford, California, USA;
2. Department of Skull Base Surgery, Clinica Bio Bio, Concepcion, Chile;
3. Department of Neurological Surgery, Hospital Clinico Regional de Concepcion, Concepcion, Chile;
4. Department of Radiology, Stanford University, Stanford, California, USA;
5. Department of Ophthalmology, Stanford University, Stanford, California, USA