title: Aetiology of cancer of the oesophagus: geographical studies in the footsteps of Marco Polo and beyond.
authors.affiliation: University Department of Surgery, General Infirmary, Leeds.
authors.forename: P M
authors.initials: PM
authors.lastname: Sagar
mesh_terms: D002681:China; D004938:Esophageal Neoplasms / Q000209:etiology*; D006801:Humans; D007492:Iran; D013019:South Africa