Inclusion Criteria:  Group A:  Children and adolescents who:  have been treated for cancer in the Division of Oncology-Hematology, Department of Pediatrics, at the Kantonsspital Aarau, have been diagnosed at age 0-18 years, are still in regular follow-up care at the Kantonsspital Aarau, have finished cancer treatment and entered follow-up care, and signed informed consent  Group B:  Adolescents and adults who:  fulfill the same inclusion criteria as Group A are not in regular follow-up care anymore  Exclusion Criteria:  Childhood Cancer Survivors who:  are in a palliative situation or have not given consent for further use of medical data