1. Department of Radiation Oncology; The University of Texas MD Anderson Cancer Center; Houston TX USA
2. Department of Imaging Physic; The University of Texas MD Anderson Cancer Center; Houston TX USA
3. Department of Clinical Oncology and Nuclear Medicine, Faculty of Medicine; University of Alexandria; Alexandria Egypt
4. Department of Biostatistics; The University of Texas MD Anderson Cancer Center; Houston TX USA
5. Department of Radiology; The University of Texas MD Anderson Cancer Center; Houston TX USA
6. Department of Radiation Physics; The University of Texas MD Anderson Cancer Center; Houston TX USA
7. Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital/Division of Health Sciences & Technology; Massachusetts Institute of Technology; Charlestown MA USA
8. Department of Head and Neck Surgery; The University of Texas MD Anderson Cancer Center; Houston TX USA
9. The University of Texas Graduate School of Biomedical Sciences; Houston TX USA