1. Department of Clinical Surgery, State University of Londrina, Londrina, Brazil
2. Department of Otorhinolaryngology, University of Sao Paulo, Sao Paulo, Brazil
3. Department of Otorhinolaryngology—Head and Neck Surgery, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, USA
4. Department of Medicine, Pontifical Catholic University of Parana, Londrina, Brazil