START adolescents: study protocol of a randomised controlled trial to investigate the efficacy of a low-threshold group treatment programme in traumatised adolescent refugees by Florian Hammerle, Michael Huss, Esther Sobanski, Andrea Dixius, Eva Möhler, Susanne Koudela-Hamila, Ulrich Ebner-Priemer, Christian J Merz, Tina In-Albon, Brigitte Pollitt, Hanna Christiansen, David Kolar, Susanne Ocker, Nicole Fischer, Ina Burghaus

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