1. Department of Otorhinolaryngology; Bellvitge University Hospital, Universitat de Barcelona, Hospitalet de Llobregat; Barcelona Spain
2. Department of Medical Oncology; Catalan Institute of Oncology, Universitat de Barcelona, Hospitalet de Llobregat; Barcelona Spain
3. Statistics Unit, Hospital Duran I Reynalds, Catalan Institute of Oncology, Hospitalet de Llobregat; Barcelona Spain
4. Department of Maxillofacial Surgery; Bellvitge University Hospital, Universitat de Barcelona, Hospitalet de Llobregat; Barcelona Spain
5. Department of Plastic and Reconstructive Surgery; Bellvitge University Hospital, Universitat de Barcelona, Hospitalet de Llobregat; Barcelona Spain
6. Department of Radiotherapy; Hospital Duran I Reynalds, Catalan Institute of Oncology, Universitat de Barcelona, Hospitalet de Llobregat; Barcelona Spain