Humans 3 adjuvant chemoradiotherapy human 3 overall survival 3 Aged 2 Article 2 Chemoradiotherapy, Adjuvant 2 Female 2 Lymphatic Metastasis 2 Male 2 Middle Aged 2 Neck Dissection 2 adult 2 aged 2 antineoplastic agent 2 cancer patient 2 cancer prognosis 2 cancer surgery 2 cancer survival 2 chemoradiotherapy 2 clinical outcome 2 comparative study 2 female 2 follow up 2 lymph node metastasis 2 lymph vessel metastasis 2 major clinical study 2 male 2 middle aged 2 neck dissection 2