1. Head, Division of Medical Oncology, Department of Oncology, King Faisal Specialist Hospital and Research Centre, Riyadh 11211, Saudi Arabia
2. Staff Radiotherapist, Division of Radiation Oncology, Department of Oncology, King Faisal Specialist Hospital and Research Centre, Riyadh 11211, Saudi Arabia
3. Staff Otolaryngologist, Department of Surgery, King Faisal Specialist Hospital and Research Centre, Riyadh 11211, Saudi Arabia
4. Head, Division of Otolaryngology, Department of Surgery, King Faisal Specialist Hospital and Research Centre, Riyadh 11211, Saudi Arabia
5. Staff Radiation Oncologist, Division of Radiation Therapy, Department of Oncology, King Faisal Specialist Hospital and Research Centre, Riyadh 11211, Saudi Arabia