Oesophageal cytological abnormalities in Transkei and possible nutritional influences.
D000328:Adult; D001741:Black or African American; D044383:Black People; D002471:Cell Transformation, Neoplastic; D004938:Esophageal Neoplasms / Q000473:pathology; D004947:Esophagus / Q000473:pathology*; D005494:Folic Acid Deficiency / Q000473:pathology*; D006801:Humans; D012424:Rural Population; D013019:South Africa