1. Department of Radiology, Chung Shan Medical University Hospital, Taichung, Taiwan;
2. Department of Medical Imaging and Radiological Sciences, Chang Gung University, Kweishan, Taiwan;
3. Radiation Biology Research Center, Institute for Radiological Research, Chang Gung University/Chang Gung Memorial Hospital, Taoyuan, Taiwan;
4. Department of Radiation Oncology, Chang Gung Memorial Hospital-Linkou Branch, Taoyuan, Taiwan;
5. Department of Medical Imaging and Radiological Sciences, Chung Shan Medical University, Taichung, Taiwan;
6. Department of Radiology, Taipei Manicipal Wan-Fang Hospital, Taipei Medical University, Taipei, Taiwan