1 Rhinology Study Group of the Young-Otolaryngologists of The International Federations of Oto-rhino-laryngological Societies (YO-IFOS), Paris, France.
2 Service of Otolaryngology, Hospital Complex of Santiago de Compostela, Santiago de Compostela, Spain.
3 Otorhinolaryngology-Head and Neck Surgery Department, Complexo Hospitalario Universitario A Coruña, A Coruña, Spain; miguel.mayo.yanez@sergas.es.
4 Service of Pneumology, Hospital Complex of Santiago de Compostela, Santiago de Compostela, Spain.