- Diagnosis: Children and adolescents with a non-organic and non-drug-induced psychosis, meeting the criteria for ICD-10 diagnoses: F20, F22-F29 and F30.2, F31.2 F31.5, F32.3 and F33.3. This is verified with a semi-structured psychopathological interview using K-SADS-PL (Kaufmann 1997) four weeks after inclusion into the trial.