Article 5 Head and Neck Neoplasms 5 Humans 5 Radiation Injuries cancer radiotherapy 5 head and neck tumor 5 human 5 radiation injury 5 head and neck cancer 4 Aged 3 adverse event 3 aged 3 cancer patient 3 cancer staging 3 female 3 intensity modulated radiation therapy 3 male 3 priority journal 3 Adult 2 Female 2 Head and neck 2 Male 2 Middle Aged 2 Radiotherapy 2 Radiotherapy, Intensity-Modulated 2 Retrospective Studies 2 adult 2 advanced cancer 2 antineoplastic agent 2 chemoradiotherapy 2