1. Department of Otolaryngology–Head and Neck SurgeryUniversity of MinnesotaMinneapolis Minnesota U.S.A.
2. Department of Otolaryngology and Head and Neck SurgeryBanco de Olhos de Sorocaba HospitalSorocaba São Paulo Brazil
3. Department of Otolaryngology and Head and Neck SurgeryCampinas State UniversityCampinas São Paulo Brazil ;
4. Paparella Ear, Head, & Neck InstituteMinneapolis Minnesota U.S.A.