Patient-reported quality of outpatient healthcare in patients with chronic back or arthrosis pain with long-term opioid therapy in Germany by Anja Niemann, Nils Frederik Schrader, Christian Speckemeier, Carina Abels, Nikola Blase, Milena Weitzel, Anja Neumann, Cordula Riederer, Joachim Nadstawek, Wolfgang Straßmeir, Jürgen Wasem, Silke Neusser

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