Background: Exposure with computed tomographies (CT) in childhood was recently linked to increased cancer risk in two large epidemiological cohort studies from England and Australia and a smaller study from Taiwan. Uncertainty remains to which extent the risk may be driven by reverse causation or confounding[for full text, please go to the a.m. URL] ; SeriesInformation ; GMDS 2014; 59. Jahrestagung der Deutschen Gesellschaft für Medizinische Informatik, Biometrie und Epidemiologie e.V. (GMDS)