1 Alfonso Lagares Abascal, Department of Neurosurgery, University Hospital 12th October, Av. De Córdoba s/n, 28041, Madrid, Spain.
2 Jose Antonio Fernandez Alen, Department of Neurosurgery, University Hospital of La Princesa, Calle de Diego de León, 62, Madrid.
3 Ana Maria Castaño León, Department of Neurosurgery, University Hospital 12th October, Av. De Córdoba s/n, 28041, Madrid, Spain.
4 Pablo Martin Munarriz, Department of Neurosurgery, University Hospital 12th October, Av. De Córdoba s/n, 28041, Madrid, Spain.
5 Luis Miguel Moreno Gómez, Department of Neurosurgery, University Hospital 12th October, Av. De Córdoba s/n, 28041, Madrid, Spain.
6 Igor Paredes, Department of Neurosurgery, University Hospital 12th October, Av. De Córdoba s/n, 28041, Madrid, Spain.
7 Irene Panero Pérez, Department of Neurosurgery, University Hospital 12th October, Av. De Córdoba s/n, 28041, Madrid, Spain. Electronic address: ipanero903@hotmail.com.