1. Department of Radiation Oncology The University of Texas MD Anderson Cancer Center Houston Texas USA
2. Department of Radiation Oncology American University of Beirut Beirut Lebanon
3. MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences Houston Texas USA
4. Department of Radiation Oncology St George University Medical Center Beirut Lebanon
5. Department of Head and Neck Surgery The University of Texas MD Anderson Cancer Center Houston Texas USA
6. Department of Otolaryngology Houston Methodist Hospital Houston Texas USA