Invasive, meddlesome pseudotherapies elicit a stronger placebo effect than puffed up sugar pills. http://www.sciencedirect.com/science/article/pii/S0149763417301744 …pic.twitter.com/eJWqQ5WcDa
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It is important not to confuse a change in questionnaire answering behaviour with a "Placebo effect". There are many such measurement biases
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