. 2010 Jun 24;12(2):e23. doi: 10.2196/jmir.1286
©David Samoocha, David J Bruinvels, Nieke A Elbers, Johannes R Anema, Allard J van der Beek. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 24.06.2010
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Figure 4.
Funnel plot for comparison of Web-based interventions versus usual care for the outcome disease-specific self-efficacy