1. Graduate Institute of Radiological Science, Central Taiwan University of Science and Technology, Takun, Taichung 406, Taiwan, ROC
2. Department of Nuclear Medicine, Taichung Veterans General Hospital, Taichung 407, Taiwan, ROC
3. Department of Radiation Oncology, Yee Zen Hospital, Taoyuan 326, Taiwan, ROC
4. Department of Radiation Oncology, Buddhist Tzu Chi General Hospital, Hualien 970, Taiwan, ROC
5. Department of Cardiology, Taichung Armed Forces General Hospital, Taichung 411, Taiwan, ROC