Efficacy of a Transdiagnostic Group Treatment for Emotional Disorders Applied in Blended Format: a Controlled Study.

This study will consist in a randomized controlled clinical trial (RCT) to test the efficacy of a blended group transversal protocol (BLGr-TP) compared to a face-to-face group transversal protocol (FFGr-TP). The main aims of the study are the following: * To analyze the differential efficacy of the BLGr-TP versus the FFGr-TP for the treatment of emotional disorders in aspects of clinical measures, as well as in terms of retention and dropout rate and adherence. * To analyze the differential acceptability of the BLGr-TP versus the FFGr-TP for the treatment of emotional disorders. In addition, it is intended to carry out a study of mediators and moderators of the efficacy of both interventions. The established hypotheses in relation to the main goals are: * Both treatment modalities (FFGr-TP and BLGr-TP) will achieve improvements in the symptoms of emotional disorders, reflected in the scores of the clinical measures. * The BLGr-TP will show equivalent efficacy to the FFGr-TP. * The BLGr-TP will show an acceptability comparable to the face-to-face protocol. Both modalities will be well valued by the participants. * In both treatment modalities, the changes achieved are expected to be maintained over time (3, 6 and 12 months).