1. Department of Diagnostic Radiology, Pediatric Radiology and Sonography, University Hospital Schleswig-Holstein, Campus Kiel, 24105 Kiel, Germany.
2. Department of Diagnostic Radiology, University Hospital Schleswig-Holstein, Campus Kiel, 24105 Kiel, Germany.
3. Department of Medical Informatics and Statistics, University Hospital Schleswig-Holstein, Campus Kiel, 24105 Kiel, Germany.
4. North German Seminar of Radiation Protection, University Kiel, 24098 Kiel, Germany.