Red/green color blindness in the Niger delta.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003117:Color Vision Defects / Q000453:epidemiology*; D004812:Epidemiologic Methods; D005260:Female; D005828:Genetics, Population; D006801:Humans; D008297:Male; D008875:Middle Aged; D009548:Niger