Echinacea for the common cold: can alternative medicine be evidence-based medicine?.
Turner
Ronald B
RB
D003139:Common Cold / Q000188:drug therapy*; D020900:Echinacea; D019317:Evidence-Based Medicine; D006801:Humans; D008517:Phytotherapy; D028321:Plant Preparations / Q000627:therapeutic use*
D028321:Plant Preparations