1. Massachusetts Eye and Ear Infirmary, Boston, Massachusetts
2. Department of Otorhinolaryngology, Santa Casa de Sao Paulo School of Medical Sciences, Sao Paulo, Sao Paulo, Brazil
3. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Scholarship, Brazil
4. Department of Otorhinolaryngology and Head and Neck Surgery/Universidade Federal de Sao Paulo, Sao Paulo, Sao Paulo, Brazil