title: The epidemiology and etiology of esophageal cancer in north China. A preliminary report.
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000494:pharmacology; D002645:Chickens; D002681:China; D004938:Esophageal Neoplasms / Q000453:epidemiology* / Q000401:mortality / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D009602:Nitrosamines / Q000494:pharmacology; D010610:Pharyngeal Neoplasms / Q000453:epidemiology; D051381:Rats
chemical_list: D009602:Nitrosamines; D001205:Ascorbic Acid