Echinacea trial.
Blumenthal
Mark
M
D002648:Child; D003139:Common Cold / Q000188:drug therapy* / Q000517:prevention & control; D020900:Echinacea; D006801:Humans; D008517:Phytotherapy; D010936:Plant Extracts / Q000627:therapeutic use*; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D012141:Respiratory Tract Infections / Q000188:drug therapy / Q000517:prevention & control*
D010936:Plant Extracts