1. Graduate Program in Surgery
2. Department of Otolaryngology, Hospital de Clínicas de Porto Alegre (HCPA); Porto Alegre RS
3. Department of Otolaryngology; School of Medical Sciences, Santa Casa de São Paulo; São Paulo SP Brazil
4. School of Medicine; Universidade Federal do Rio Grande do Sul (UFRGS); Scientific Initiation Scholars (FAPERGS)