Additional file 14.
Funnel plot of the comparisons of aerobic exercise versus controls on pain. Scatter plot of the intervention effect estimates (standardised mean differences (SMD)) from individual studies against their standard errors (SE) (on a reversed scale). Publication bias may lead to asymmetry in funnel plots on visual inspection.
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Häuser et al. Arthritis Research & Therapy 2010 12:R79 doi:10.1186/ar3002