Brief Transdiagnostic Group CBT for Adolescents With Internalizing Problems: A Randomized Waitlist Controlled Trial

Inclusion Criteria: * 1 SD above normal population mean on the Revised Children's Anxiety and Depression Scale (parent- or self-report), subscale or total score OR a K-SADS-PL confirmed anxiety or depressive disorder. Exclusion Criteria: * Inadequate language proficiency by the patient or the parent. * The presence of other psychiatric disorders having a higher treatment priority (i.e., psychosis and acute sucide risk) * Intellectual Disability