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. 2007 Apr 18;2007(2):CD003338. doi: 10.1002/14651858.CD003338.pub3

Comparison 1. Passive intervention versus placebo.

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
1 Improvement 1   Risk Ratio (M‐H, Random, 95% CI) Totals not selected
1.1 +/‐ 4 weeks 1   Risk Ratio (M‐H, Random, 95% CI) 0.0 [0.0, 0.0]
1.2 +/‐ 12 weeks 1   Risk Ratio (M‐H, Random, 95% CI) 0.0 [0.0, 0.0]