1. Department of Diagnostic Radiology, Keelung Chang Gung Memorial Hospital, Keelung, Taiwan.
2. Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan.
3. National Yang Ming Chiao Tung University School of Medicine, Taipei, Taiwan.
4. Department of Medical Imaging and Intervention, Linkou Chang Gung Memorial Hospital, College of Medicine, Chang Gung University, Taoyuan, Taiwan.
5. Department of Medical Imaging and Radiological Science, Chang Gung University, Taoyuan, Taiwan.