1. Department of Otorhinolaryngology, Santa Bárbara Hospital, Soria, Spain
2. Department of Otorhinolaryngology, Lozano Blesa University Clinical Hospital, Zaragoza, Spain
3. Department of Otorhinolaryngology, Miguel Servet University Hospital, Zaragoza, Spain
4. Faculty of Veterinary Sciences, Department of Animal Pathology, University of Zaragoza, Zaragoza, Spain