1. Department of Otolaryngology, Harvard Medical School, Boston, Massachusetts
2. Division of Otolaryngology, Brigham and Women's Hospital, Boston, Massachusetts
3. Department of Otolaryngology, Boston University School of Medicine, Boston, Massachusetts
4. Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts
5. Department of Otolaryngology, Faculdade de Ciencias Medicas da Santa Casa de Sao Paulo, Sao Paulo, Brazil