title: Second primary respiratory tract and oesophageal cancers following head and neck malignancy.
mesh_terms: D004938:Esophageal Neoplasms; D006258:Head and Neck Neoplasms; D006801:Humans; D009378:Neoplasms, Multiple Primary; D012142:Respiratory Tract Neoplasms; D012306:Risk; D013997:Time Factors