“…The systematic literature searches identified twelve studies: seven cross-sectional studies [ 5 ], [ 6 ], [ 7 ], [ 8 ], [ 9 ], [ 10 ], [ 11 ], one register study [ 12 ], and four cohort studies [ 13 ], [ 14 ], [ 15 ], [ 16 ]. Seven studies investigated national data [ 5 ], [ 7 ], [ 8 ], [ 9 ], [ 10 ], [ 11 ], [ 12 ] and one study European data of 36 countries [ 6 ] on collective effective doses of ionising radiation by different diagnostic procedures and total collective effective doses. The cohort studies [ 13 ], [ 14 ], [ 15 ], [ 16 ] investigated the risk of children having been exposed to ionizing radiation by CT examinations for the development of malign neoplasms or haemoblastoma.…”