1. Department of Otolaryngology Head and Neck Surgery, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu 221006, P.R. China
2. Department of Otolaryngology Head and Neck Surgery, Xuzhou Cancer Hospital, Xuzhou, Jiangsu 221005, P.R. China
3. Department of Otolaryngology Head and Neck Surgery, The First Clinical Medical College of Xuzhou Medical University, Xuzhou, Jiangsu 221004, P.R. China
4. Research Institute of Otolaryngology, Gulou Hospital Affiliated to Medical College of Nanjing University, Nanjing, Jiangsu 210008, P.R. China