1. Department of Radiology, Nagoya City University Graduate School of Medical Sciences, Nagoya 467-8601, Japan
2. Department of Radiology, Nagoya City Wet Medical Center, Nagoya 462-8508, Japan
3. Department of Radiology, Ichinomiya Municipal Hospital, Ichinomiya 491-0041, Japan
4. Department of Radiology, Koseikai Hospital, Toyohashi 440-0045, Japan
5. Department of Oncology, Immunology and Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 467-8601, Japan