Affiliation: | 1. Department of Otorhinolaryngology Head and Neck Surgery, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China;2. Department of Otorhinolaryngology Head and Neck Surgery, Xi'an Jiaotong University, Xi'an, Shaanxi, China;3. Department of General Surgery, Yan'an University Affiliated Hospital, Yan'an, Shaanxi, China |