Inborn Errors of Metabolism Disorders

"Rare Diseases" is an umbrella term including more than 8.000 different diseases which individually affect only a small percentage of people. Rare diseases predominantly affect children and adolescents and are associated with high medical and psychosocial burden of disease. The investigators invented Education \& Care in RARE - a short-term, structured, resource-oriented and child-friendly psychoeducation program for children and adolescents with rare diseases. This study is a prospective, multicenter, randomized and controlled study with a waiting list. Aim of the study is to investigate the efficacy of Education \& Care in RARE on knowledge about rare diseases and on mental health well-being in pediatric rare disease patients, compared to a control group. In this study participants are randomized in an intervention group and a waiting list control group. Both study groups thus receive the psychoeducation with Education \& Care in RARE and complete the identical questionnaires. Compared to the Intervention group, the waiting list control group receives the intervention with a time delay (8-12 weeks later) and has one additional appointment for questionnaire evaluation before st