[An epidemiological analysis of esophageal cancer among migrants from Henan Province].
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D000328:Adult; D000368:Aged; D002681:China; D004034:Diet Surveys; D004938:Esophageal Neoplasms / Q000208:ethnology* / Q000401:mortality; D004947:Esophagus / Q000473:pathology; D006801:Humans; D006965:Hyperplasia; D008875:Middle Aged