Klimas J, Hamilton MA, Carney G, Cooper IR, Croteau NS, Dong H, Dormuth C, Maclure M, Socías ME, Ti L, Wood E, McCracken R Individualized prescribing portraits to reduce inappropriate initiation of opioid analgesics to opioid naïve patients in primary care: protocol for a randomized controlled trial Contemp Clin Trials PubMed