Study protocol for the COMET study: a cluster-randomised, prospective, parallel-group, superiority trial to compare the effectiveness of a collaborative and stepped care model vers... by Hans-Helmut König, Olaf von dem Knesebeck, Karl Wegscheider, Martin Härter, Jörg Dirmaier, Bernd Löwe, Bernd Schulte, Daniela Heddaeus, Christian Brettschneider, Anne Daubmann, Thomas Grochtdreis, Kerstin Maehder, Sarah Porzelt, Moritz Rosenkranz, Ingo Schäfer, Martin Scherer, Angelika Weigel, Silke Werner, Thomas Zimmermann

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