[1] Air Force Mil Med Univ, Xijing Hosp, Dept Otolaryngol Head & Neck Surg, 127 Changle West Rd, Xian 710032, Shaanxi, Peoples R China
[2] Xi An Jiao Tong Univ, Xian Childrens Hosp, Dept Otolaryngol Head & Neck Surg, Xian, Peoples R China
[3] Ansai Dist Peoples Hosp, Dept Otolaryngol Head & Neck Surg, Yanan, Peoples R China