Blended digital health intervention for adolescents at high risk with digital media use disorders: protocol for a randomised controlled trial within the Res@t-Consortium - Labrenz, Oliver; Waedel, Lucie; Kölch, Michael; Lezius, Susanne; Wacker, Christina; Fröhlich, Antonia; Paschke, Kerstin; Thomasius, Rainer; Reis, Olaf (Frontiers in Psychiatry, 2025)