1. Department of Radiation Oncology; The University of Texas MD Anderson Cancer Center; Houston Texas
2. Department of Clinical Oncology and Nuclear Medicine, Faculty of Medicine; University of Alexandria; Alexandria Egypt
3. Department of Head and Neck Surgery; The University of Texas MD Anderson Cancer Center; Houston Texas
4. Department of Radiation Oncology; Henry Ford Health System; Detroit Michigan
5. Department of Medical Oncology; The University of Texas MD Anderson Cancer Center; Houston Texas
6. Department of Pathology; The University of Texas MD Anderson Cancer Center; Houston Texas
7. Department of Diagnostic Imaging; The University of Texas MD Anderson Cancer Center; Houston Texas
8. Department of Radiation Oncology; Sisli Etfal Teaching and Research Hospital; Istanbul Turkey