1. Universidade Federal do Rio Grande do Sul, Member of the Craniofacial Surgery Group of Hospital de Clinicas de Porto Alegre, Fellowship on Otology and Cochlear Implants of Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil.
2. Craniomaxillofacial Surgery, Universidade Federal do Rio Grande do Sul, Head of the Craniofacial Surgery Group of Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil.
3. Otorhinolaryngology, Universidade Federal do Rio Grande do Sul, Head of the Chronic Otitis Media Center of Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil.