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3142 Public health care science
1
ASCORBIC-ACID
1
Administration
1
Ascorbic Acid [administration & dosage
1
Common Cold [drug therapy
1
D-ISOASCORBIC ACID
1
DOUBLE-BLIND
1
Humans
1
LARGE-SCALE
1
Oral
1
RANDOMIZED CONTROLLED-TRIAL
1
RESPIRATORY-TRACT INFECTIONS
1
Randomized Controlled Trials as Topic
1
Respiratory Tract Infections [drug therapy
1
SUPPLEMENTATION
1
SYMPTOMS
1
TWIN CONTROL
1
WINTER ILLNESS
1
environmental and occupational health
1
prevention & control]
1
therapeutic use]
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