New ways to cope with depression—study protocol for a randomized controlled mixed methods trial of bouldering psychotherapy (BPT) and mental model therapy (MMT) - Kind, Leona; Luttenberger, Katharina; Leßmann, Vivien; Dorscht, Lisa; Mühle, Christiane; Müller, Christian P.; Siegmann, Eva-Maria; Schneider, Sophia; Kornhuber, Johannes (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2023)