1. Institute of Radiation Medicine, Fudan University, Shanghai 200032, P.R. China
2. Department of Otolaryngology‑Head and Neck Surgery, Shanghai Key Clinical Disciplines of Otorhinolaryngology, Eye and ENT Hospital of Fudan University, Shanghai 200031, P.R. China
3. Department of Otolaryngology‑Head and Neck Surgery, Dankook University, Cheonan, Chungcheongnam 330‑715, Republic of Korea