Conditioned open-label placebos to facilitate opioid reduction in patients with chronic non-cancer pain: study protocol of a randomised controlled trial by Cosima Locher, Antje Frey Nascimento, Isabelle Arnet, Roland von Känel, Joram Ronel, Konrad Streitberger, Michael Bernstein, Helen Koechlin, Katja Carratta, Kiara Bodonyi, Daniel Friis, Lukas Bircher, Alfred Josef Roth, Elisabeth Olliges

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