title: Vitamin A assessment by the isotope-dilution technique: good news from Guatemala.
authors.forename: J A
authors.initials: JA
authors.lastname: Olson
mesh_terms: D000368:Aged; D000818:Animals; D005260:Female; D006166:Guatemala; D006801:Humans; D008297:Male; D008875:Middle Aged; D011865:Radioisotope Dilution Technique; D051381:Rats; D014801:Vitamin A / Q000032:analysis*; D014802:Vitamin A Deficiency / Q000175:diagnosis