1. Otolaryngology Head and Neck Surgery, Fourth Affiliated Hospital of Harbin Medical University, Harbin 150001, Heilongjiang, PR China
2. Department of Anatomy and Tissue Training, Heilongjiang University of Traditional Chinese Medicine, Harbin 150040, Heilongjiang, PR China
3. Department of Otolaryngology, Harbin Second Hospital, Harbin 150056, Heilongjiang, PR China
4. Otolaryngology Department, Zhalantun People’s Hospital, Zhalantun 162650, Neimenggu, PR China