STUDIES OF SERUM CAROTENOIDS AND VITAMIN A IN IOWA SCHOOL CHILDREN.
D000293:Adolescent; D001774:Blood Chemical Analysis; D002338:Carotenoids; D002648:Child; D006801:Humans; D007484:Iowa; D009749:Nutrition Surveys; D014801:Vitamin A
D014801:Vitamin A; D002338:Carotenoids
ADOLESCENCE; BLOOD CHEMICAL ANALYSIS; CAROTENOIDS; CHILD; NUTRITION SURVEYS; VITAMIN A