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Characteristics of excluded studies [ordered by study ID]
| Study | Reason for exclusion |
|---|---|
| Bonnert 2014 | Open trial, no control group |
| Long 2009 | Usability evaluation of online treatment |
| Merlijn 2005 | N < 10 in at least 1 arm of the trial |
| Trautmann 2008 | N < 10 in at least 1 arm of the trial |
