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Looking inside the black box: a theory-based process evaluation alongside a randomised controlled trial of printed educational materials (the Ontario printed educational message, OPEM) to improve referral and prescribing practices in primary care in Ontario, Canada
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* Corresponding author: Jeremy M Grimshaw jgrimshaw@ohri.ca
- Equal contributors
Implementation Science 2007, 2:38 doi:10.1186/1748-5908-2-38