1. Department of Medical Oncology, Virgen del Rocío University Hospital, Seville, Spain
2. Department of Radiation Oncology, Virgen del Rocío University Hospital, Seville, Spain
3. Department of Otorhinolaryngology, Virgen del Rocío University Hospital, Seville, Spain
4. University of Málaga, Málaga, Spain
5. Department of Pathology, Virgen del Rocío University Hospital, Seville, Spain
6. Instituto de Biomedicina de Sevilla, IBIS/Hospital Universitario Virgen del Rocío/ Universidad de Sevilla/ Consejo Superior de Investigaciones Científicas, Seville, Spain