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Stulz, Niklaus; Lutz, Wolfgang; Leach, Chris; Lucock, Mike; Barkham, Michael (2007). Shapes of early change in psychotherapy under routine outpatient conditions. Journal of consulting and clinical psychology, 75(6), pp. 864-874. Washington, D.C.: American Psychological Association 10.1037/0022-006X.75.6.864
