Cancer Survivors: Researchers will include 150 children and adolescents aged 7-16 years who received an initial diagnosis of cancer with / without CNS (central nervous system) involvement in the past 10 years and terminated their treatment (surgery, radiation, and / or chemotherapy) at least 12 months prior to their participation in the study. Cancer survivors will be recruited at two different specialized pediatric units in Switzerland. In order to minimize the heterogeneity of the sample, children with a history of cancer without CNS involvement and only surgical removal of the tumor without subsequent radiation and / or chemotherapy will be excluded from the study. Because of the increased likelihood of drop-out of children with a history of cancer in a longitudinal study, more than the statistically required quantity of participants (> 25 children per group) will be recruited to reach sufficient statistical power.