1. Department of Radiology, Clinica Universidad de Navarra, 28027 Madrid, Spain
2. Department of Otorhinolaryngology, Clinica Universidad de Navarra, 31008 Pamplona, Spain
3. Department of Radiology, Clinica Universidad de Navarra, 31008 Pamplona, Spain
4. Department of Otorhinolaryngology, Clinica Universidad de Navarra, 28027 Madrid, Spain