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Lutz, Wolfgang; Leon, Scott; Martinovich, Zoran; Lyons, John; Stiles, William (2007). Therapist effects in outpatient psychotherapy: A three-level growth curve approach. Journal of counseling psychology, 54(1), pp. 32-39. Dubuque, Iowa: American Psychological Association 10.1037/0022-0167.54.1.32
