Evaluation of the protein biomarkers and the analgesic response to systemic methylene blue in patients with refractory neuropathic pain: a double-blind, controlled study.

J Pain Res · 2015 · PMC4509536 · PMID 26213475

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did not reach statistical significanceno p-value reported

The placebo effect at 60 minutes was relatively large, although it did not reach statistical significance.

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