Effectiveness of an app-based intervention to reduce substance use, gambling, and digital media use in vocational school students: study protocol for a randomized controlled trial by Nicolas Arnaud, Johanna Weymann, Kirsten Lochbühler, Benjamin Pietsch, Monika Rossa, Ludwig Kraus, Rainer Thomasius, Reiner Hanewinkel, Matthis Morgenstern

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