Placebo in headache trials.
Diener
Hans-Christoph
HC
D032984:Ethics, Research; D006261:Headache / Q000188:drug therapy*; D006801:Humans; D015990:Placebo Effect; D010919:Placebos / Q000627:therapeutic use*; D016032:Randomized Controlled Trials as Topic / Q000941:ethics
D010919:Placebos