The defense session of the research diploma thesis of Ms. Sara Mehri, a student of the research diploma program at the Craniomaxillofacial Research Center, titled: "Assessment of Quality of Life in Patients With Head and neck Cancer After Surgical operation: A Retrospective cohort study" was held with the esteemed presence of Dr. Amir Jalal Abbasi, Dr. Naghmeh Bahrami on Saturday, October 15, 2025, at the Craniomaxillofacial Research Center.