1. Department of Otolaryngology-Head and Neck Surgery; University of Minnesota; Minneapolis Minnesota
2. Department of Otolaryngology, Head and Neck Surgery; University of Campinas-UNICAMP; Campinas
3. Department of Otolaryngology; Washington University in St. Louis School of Medicine; St. Louis Missouri U.S.A
4. Department of Otorhinolaryngology Head and Neck Surgery; Universidade Federal de São Paulo (UNIFESP)/Escola Paulista de Medicina (UNIFESP/EPM); São Paulo Brazil
5. Paparella Ear, Head and Neck Institute; Minneapolis Minnesota