1. Department of Health Sciences School of Medicine Anahuac University Network Naucalpan de Juarez Mexico
2. Undergraduate Internal Medical Teaching Department ABC Medical Center I.A.P. Centro Médico ABC Mexico City Mexico
3. Department of Otolaryngology, Head and Neck Surgery Universidad del Ejercito y Fuerza Aerea Mexico City Mexico
4. Department of Otolaryngology, Head and Neck Surgery Corporativo Hospital Satelite Naucalpan Mexico
5. Department of Interventional Neuroradiology Hospital Angeles Lomas Huixquilucan Mexico
6. Department of Otolaryngology, Head and Neck Surgery Hospital Central Militar Miguel Hidalgo Mexico