With reference to the article Nikkilä A, Raitanen J, Lohi O, Auvinen A. Radiation exposure from computerized tomography and risk of childhood leukemia: Finnish register-based case-control study of childhood leukemia (FRECCLE). Haematologica. 2018;103(11):1873-1880, it has come to the authors' attention that the reported total number of computed tomography (CT) scans in our article was incorrect. The reported numbers were, in fact, the expected numbers prior to the CT scan collection from

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... ls. Fortunately, this does not affect the number of CT scans to the study subjects and, thus, all results regarding childhood leukemia remain unchanged. The errors and their corrections are listed below. Table 1. The collection and availability of electronically stored computed tomography scans. Data on a total of 80,783 pediatric CT scans were obtained and of those, 49 CT scans were performed on the study subjects, excluding the 2-year latency period (Table 1) . Half (n=25) were head scans, and 19 were lung scans. Of the CT scans, 36 were performed on 15 (1.4%) cases and 13 scans on 10 (0.3%) controls. The corrected version of the sentence is published below. Data on a total of 72,673 pediatric CT scans were obtained and of those, 49 CT scans were performed on the study subjects, excluding the 2-year latency period (Table 1) . Half (n=25) were head scans, and 19 were lung scans. Of the CT scans, 36 were performed on 15 (1.4%) cases and 13 scans on 10 (0.3%) controls.