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Age, site and gender distributions according to smoking and drinking habits in patients with SCCHN. NSND: Non-smokers/non-drinkers; SD: smokers/drinkers; SND: smokers-only; NSD: drinkers-only. OC: oral cavity; OP: oropharynx; L: larynx; HP: hypopharynx; other: other combination of sites.
