Exceeding the guideline-recommended maximum daily dose of opioids for long-term treatment of non-cancer pain in Germany - a large retrospective observational study by Nils Frederik Schrader, Anja Niemann, Milena Weitzel, Christian Speckemeier, Carina Abels, Nikola Blase, Godwin Denk Giebel, Cordula Riederer, Joachim Nadstawek, Wolfgang Straßmeir, Jürgen Wasem, Silke Neusser

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