routes on pain and adverse euphoria events. Data sources A systematic search was
performed in PubMed, ScienceDirect, ClincalTrials. gov, Scopus, Cochrane Library, and
Embase from inception until June 2017. Study selection Randomized controlled trials
investigating the effects of cannabis or cannabinoids on pain reduction. Data extraction Two
reviewers extracted and assessed the quality of studies by means of Cochrane risk of bias …