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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: Pain. 2018 Nov;159(11):2339–2346. doi: 10.1097/j.pain.0000000000001340

Figure 1.

Figure 1.

Flowchart of study selection. Number of studies indicate number of comparisons of a drug against placebo. aPlease see PRISMA flowchart in Finnerup, Attal et al. 2015 [6], bStudy outcome based on the primary outcome.