1. Department of Radiological Technology, Tsuchiya General Hospital, Hiroshima, Japan
2. Department of Diagnostic Radiology, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
3. Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
4. Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
5. Department of Diagnostic Radiology, Tsuchiya General Hospital, Hiroshima 730-8655, Japan
6. Department of Pediatric Cardiology, Tsuchiya General Hospital, Hiroshima, Hiroshima, Japan
7. Department of Diagnostic Radiology, National Center for Child Health and Development, Tokyo, Japan