| http://www.w3.org/ns/prov#value | - In a follow-up meta-analysis with many more laboratory studies (from 14 to 21 studies including control, placebo treatment, randomization and pain measures), the authors found that the magnitude of placebo analgesia in laboratory settings was fivefold larger than analgesia in placebo control studies [32].Such a difference might be due to the context features of clinical trials versus experimental
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