[1] Univ Fed Rio Grande do Sul, UFRGS, BR-90046900 Porto Alegre, RS, Brazil
[2] Hosp Clin Porto Alegre, ENT Residency, Porto Alegre, RS, Brazil
[3] Harvard Univ, Massachusetts Eye & Ear Infirm, Pediat ENT Div, Sch Med, Boston, MA 02114 USA
[4] Fed Univ Hlth Sci, Porto Alegre, RS, Brazil
[5] Univ Fed Rio Grande do Sul, Grad Program Med Sci, Porto Alegre, RS, Brazil
[6] Univ Coimbra, P-3000 Coimbra, Portugal
[7] Univ Caxias Sul, Caxias Do Sul, RS, Brazil
[8] Soc Otorhinolaryngol Rio Grande Sul, Porto Alegre, RS, Brazil
[9] Pontificia Univ Catolica Rio Grande do Sul, Porto Alegre, RS, Brazil
[10] Univ Fed Pelotas, Pelotas, Brazil
[11] Univ Fed Ciencias Saude Porto Alegre, Porto Alegre, RS, Brazil