Long-term opioid therapy for chronic noncancer pain: second update of the German guidelines by Frank Petzke, Frietjof Bock, Michael Hüppe, Monika Nothacker, Heike Norda, Lukas Radbruch, Marcus Schiltenwolf, Matthias Schuler, Thomas Tölle, Anika Viniol, Winfried Häuser

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