1. LINT, Facultad de Medicina, Universidad Nacional de Tucumán, San Miguel de Tucumán 4000, Argentina
2. Departamento de Neurocirugía, FLENI, Buenos Aires 1625, Argentina
3. Hospital Virgen del Rocío, 41013 Sevilla, Spain
4. Endoscopic Laboratory of Anatomy Center, Medical University of Vienna, 1090 Vienna, Austria
5. Department of Neurosurgery, University of Cape Town, Cape Town 7701, South Africa
6. Division of Neurosurgery, Department of Neurosciences, Reproductive and Odontostomatological Sciences, Universita’ degli Studi di Napoli Federico II, 80131 Naples, Italy