1. Department of Medical Imaging and Intervention, Chang Gung Memorial Hospital, Keelung and Chang Gung University, Taiwan
2. Department of Medical Imaging and Intervention, Chang Gung Memorial Hospital, Linkou and Chang Gung University, Taiwan
3. Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
4. Department of Radiology, Brigham and Womens Hospital, Harvard Medical School, Boston, MA, USA