Vitamin C and upper respiratory illness in Navaho children: preliminary observations (1974).
D000293:Adolescent; D000367:Age Factors; D001130:Arizona; D001205:Ascorbic Acid / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D002648:Child; D002986:Clinical Trials as Topic; D003139:Common Cold / Q000188:drug therapy*; D006801:Humans; D007198:Indians, North American; D010919:Placebos
D010919:Placebos; D001205:Ascorbic Acid