Interventions for physician prescribers of opioids for chronic non-cancer pain: protocol for an overview of systematic reviews by Brett D Thombs, Sonia Johnson, Kristian B Filion, Andrew Taylor, Jonathan Kimmelman, Erica Wennberg, Genevieve Gore, Irina Kudrina, Mark J Eisenberg, Sarah B Windle, Elena Paraskevopoulos, Marc O Martel

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