New versus old placebos.
Okada
F
F
D004311:Double-Blind Method; D005060:Europe; D006801:Humans; D007258:Informed Consent; D007564:Japan; D010358:Patient Participation; D010361:Patients / Q000523:psychology*; D010919:Placebos; D014481:United States
D010919:Placebos