1. Division of Radiation Oncology, Department of Radiology Far Eastern Memorial Hospital New Taipei City Taiwan
2. School of Medicine, College of Medicine National Yang Ming Chiao Tung University Taipei Taiwan
3. Division of Medical Imaging, Department of Radiology Far Eastern Memorial Hospital New Taipei City Taiwan
4. Division of Radiation Oncology, Department of Oncology Taipei Veterans General Hospital Taipei Taiwan
5. Department of Biomedical Imaging and Radiological Sciences National Yang Ming Chiao Tung University Taipei Taiwan
6. Department of Radiation Oncology, Wan Fang Hospital Taipei Medical University Taipei Taiwan