1 Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China.
2 Department of Radiology, Shuang-Ho Hospital, Taipei Medical University, New Taipei City, Taiwan, Republic of China.
3 Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, Republic of China.
4 Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China; Department of Heavy Particles and Radiation Oncology, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China.
5 Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, Republic of China. Electronic address: [email protected].