Article 9 cancer radiotherapy human 9 Humans 7 aged 6 male 6 radiation dose 6 adult 5 clinical article 5 Head and Neck Neoplasms 4 Male 4 female 4 head and neck tumor 4 intensity modulated radiation therapy 4 priority journal 4 Adult 3 Female 3 Middle Aged 3 Radiation Injuries 3 Radiotherapy 3 Retrospective Studies 3 adverse event 3 bone necrosis 3 cancer patient 3 case report 3 computer assisted tomography 3 head and neck cancer 3 middle aged 3 organs at risk 3 procedures 3