1. Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan
2. Department of Radiation Oncology, Chang Gung Memorial Hospital, Kaohsiung, Taiwan
3. Center for General Education, Chang Gung University, Taoyuan, 333, Taiwan
4. Department of Biomedical Imaging and Radiological Sciences, National Yang Ming Chiao Tung University, Taipei 112, Taiwan