. . . "Cancer of the esophagus approaches to the etiology" . . "Cancer of the esophagus approaches to the etiology"@en . . . . . . "Electronic books"@en . . . "Cancer of the esophagus : approaches to the etiology" . . . . . . . . "Tumeurs de l'oesophage étiologie." . . "Esophageal Neoplasms etiology." . . "Esophageal neoplasms Etiology." . "Esophageal Neoplasms etiology" . . . "Speiseröhrenkrebs." . . "Ätiologie." . .