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Gensichen, J; von Korff, M; Peitz, M; Muth, C; Beyer, M; Güthlin, C; Torge, M; Petersen, J J; Rosemann, T; König, J; Gerlach, F M (2009). Case management for depression by health care assistants in small primary care practices: a cluster randomized trial. Annals of Internal Medicine, 151(6):369-378.