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Abbreviations: ASA, American Society of Anesthesiologists; CRT, chemoradiotherapy; CSS, cancer-specific survival; DSS, disease-specific survival; FU, fluorouracil; GI, gastrointestinal; HNC, head and neck cancer; HR, hazard ratio; KPS, Karnofsky Performance Status; LC, local control; NA, not available; OR, odds ratio; OS, overall survival; PFS, progression-free survival; pts, patients; RR, relative risk; RT, radiotherapy.
