1. Department of Radiology, Massachusetts General Hospital, Harvard Medical School , Boston, MA 02114, United States
2. Department of Radiology, Gifu University , Gifu 501-1194, Japan
3. Department of Radiology, King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Faculty of Medicine, Chulalongkorn University , Bangkok 10330, Thailand
4. Department of Pathology, Massachusetts General Hospital and Harvard Medical School , Boston, MA 02114, USA