Lessons learned from attempts to establish the blind in placebo-controlled trials of zinc for the common cold.
Desbiens
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D003139:Common Cold / Q000188:drug therapy*; D004311:Double-Blind Method; D006801:Humans; D010919:Placebos; D016032:Randomized Controlled Trials as Topic / Q000592:standards*; D012107:Research Design / Q000592:standards; D019345:Zinc Acetate / Q000627:therapeutic use*
D010919:Placebos; D019345:Zinc Acetate