[Drug studies. Why placebo is so often omitted].
Escher
Wolfgang
W
D002986:Clinical Trials as Topic; D006801:Humans; D008517:Phytotherapy; D010919:Placebos / Q000627:therapeutic use; D010936:Plant Extracts / Q000627:therapeutic use*; D006255:Rhinitis, Allergic, Seasonal / Q000188:drug therapy*
D010919:Placebos; D010936:Plant Extracts