1. Medical Physics and Informatics Laboratory of Electronics Engineering, National Kaohsiung University of Science and Technology, Kaohsiung Taiwan, ROC
2. Department of Radiation Oncology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung Taiwan, ROC
3. College of Medicine, Kaohsiung Medical University, Kaohsiung Taiwan, ROC