[1] Hosp Clin Univ Chile, Santiago, Chile
[2] Univ Chile, Fac Med, Dept Otorhinolaryngol, Santiago, Chile
[3] Univ Chile, Fac Med, Interdisciplinary Program Physiol & Biophys, Santiago, Chile
[4] Hosp Clin Univ Chile Jose Joaquin Aguirre, Otorhinolaryngol, Santos Dumont 990, Santiago 8380456, Chile