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Flückiger, Christoph; Del Re, A.C.; Munder, Thomas; Heer, Sara; Wampold, Bruce E. (2014). Enduring effects of evidence-based psychotherapies in acute depression and anxiety disorders versus treatment as usual at follow-up — A longitudinal meta-analysis. Clinical psychology review, 34(5), pp. 367-375. Elsevier Science 10.1016/j.cpr.2014.05.001