Is the placebo powerless?
Einarson
T E
TE
Hemels
M
M
Stolk
P
P
D006801:Humans; D015990:Placebo Effect; D010919:Placebos / Q000627:therapeutic use*; D016032:Randomized Controlled Trials as Topic / Q000379:methods; D012107:Research Design
D010919:Placebos