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Influence of Control Group on Effect Size in Trials of Acupuncture for Chronic Pain: A Secondary Analysis of an Individual Patient Data Meta-Analysis
- Hugh MacPherson,
- Emily Vertosick,
- George Lewith,
- Klaus Linde,
- Karen J. Sherman,
- Claudia M. Witt,
- Andrew J. Vickers,
- on behalf of the Acupuncture Trialists' Collaboration
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- Published: April 4, 2014
- https://doi.org/10.1371/journal.pone.0093739