1. Department of Neurosurgery, Centro Médico “Lic. Adolfo López Mateos”, ISEM. Av Nicolás San Juan S/N, Colonia ex-Hacienda la Magdalena, Toluca, Estado de México, México.
2. Radioneurosurgery Unit, Neurological Center, Department of Neurosurgery, National Institute of Neurology and Neurosurgery “Dr. Manuel Velasco Suarez”, Av. Insurgentes Sur No. 3877, La Fama, México.
3. American British Cowray Medical Center, Carlos Graef Fernández No. 154, Col. Santa Fe, Cuajimalpa, México City, México.