title: Letter to the editor: second, third, and fourth head and neck tumors. A progressive decrease in survival.
authors: Division of Clinical Research and Biostatistics, Malabar Cancer Centre, Thalassery-670103, India.
authors: Atanu
authors: A
authors: Bhattacharjee
authors: Subhradev
authors: S
authors: Sen
mesh_terms: D005260:Female; D006258:Head and Neck Neoplasms / Q000401:mortality*; D006801:Humans; D008297:Male; D016609:Neoplasms, Second Primary / Q000401:mortality*