Serum vitamin A level of secondary school children.
D000293:Adolescent; D002338:Carotenoids / Q000097:blood; D002648:Child; D006801:Humans; D007194:India; D008297:Male; D014801:Vitamin A / Q000097:blood*; D014802:Vitamin A Deficiency / Q000097:blood / Q000453:epidemiology*
D014801:Vitamin A; D002338:Carotenoids