[1] Inst Nacl Neurol & Neurocirugia Manuel Velasco Su, Dept Neurol Surg, Insurgentes 3877,Colonia Fama, Mexico City, DF, Mexico
[2] Inst Nacl Neurol & Neurocirugia Manuel Velasco Su, Dept Neurootol, Mexico City, DF, Mexico
[3] Amer British Cowdry Hosp, Dept Neurotol, Neurol Ctr, Santa Fe Campus, Mexico City, DF, Mexico