Vitamin C prophylaxis in a boarding school.
D000293:Adolescent; D000367:Age Factors; D001130:Arizona; D001205:Ascorbic Acid / Q000008:administration & dosage / Q000097:blood / Q000627:therapeutic use*; D002648:Child; D002986:Clinical Trials as Topic; D003371:Cough / Q000517:prevention & control; D004341:Drug Evaluation; D005260:Female; D006801:Humans; D008297:Male; D010919:Placebos; D012112:Residential Facilities; D012141:Respiratory Tract Infections / Q000453:epidemiology / Q000517:prevention & control*; D012621:Seasons; D012737:Sex Factors; D013607:Tablets
D010919:Placebos; D013607:Tablets; D001205:Ascorbic Acid