Letter: High esophageal cancer rates in humans and chickens in North China.
D000818:Animals; D002294:Carcinoma, Squamous Cell / Q000453:epidemiology* / Q000662:veterinary; D002645:Chickens; D002681:China; D004938:Esophageal Neoplasms / Q000453:epidemiology* / Q000662:veterinary; D006801:Humans; D011201:Poultry Diseases / Q000453:epidemiology*