title: Multiple primary tumours of the upper aerodigestive tract.
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000175:diagnosis / Q000453:epidemiology*; D006801:Humans; D007822:Laryngeal Neoplasms / Q000175:diagnosis / Q000453:epidemiology*; D009062:Mouth Neoplasms / Q000175:diagnosis / Q000453:epidemiology*; D009378:Neoplasms, Multiple Primary / Q000175:diagnosis / Q000453:epidemiology*; D010610:Pharyngeal Neoplasms / Q000175:diagnosis / Q000453:epidemiology*; D011446:Prospective Studies; D012189:Retrospective Studies