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. Author manuscript; available in PMC: 2011 May 23.
Published in final edited form as: Cochrane Database Syst Rev. 2009 Jan 21;(1):CD007587. doi: 10.1002/14651858.CD007587

Figure 4.

Figure 4

Forest plot of comparison: 2 Acupuncture vs. sham interventions, outcome: 2.2 Number of headache days.