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Dr. Arthur K. Shapiro of the Payne-Whitney Psychiatric Clinic at New York Hospital has adopted a broader view of the placebo. He describes the placebo as any treatment (or any part of a treatment) which does not have a specific action on the patient’s symptoms or disease but which nonetheless may have an effect upon the patient.
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Herbert Benson (The Mind Body Effect: How to Counteract the Harmful Effects of Stress)