1. Department of Radiation Oncology, Taipei City Hospital, Taipei 110, Taiwan
2. Institute of Neuroscience, National Cheng Chi University, Taipei 116, Taiwan
3. Radiotherapy, Department of Medical Imaging, Cheng Hsin General Hospital, Taipei 112, Taiwan
4. Department of Biomedical Imaging and Radiological Sciences, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
5. Rutgers Cancer Institute of New Jersey, Rutgers University, New Brunswick, NJ 08903-2681, USA
6. Cancer Progression Research Center, National Yang Ming Chiao Tung University, Taipei 112, Taiwan