[1] Zhengzhou Childrens Hosp, Henan Childrens Hosp, Dept Otorhinolaryngol Head & Neck Surg, Zhengzhou 450003, Peoples R China
[2] Capital Med Univ, Beijing Childrens Hosp, Natl Ctr Childrens Hlth, Dept Otolaryngol Head & Neck Surg, Beijing 100045, Peoples R China
[3] Zhengzhou Childrens Hosp, Henan Childrens Hosp, Dept Otorhinolaryngol Head & Neck Surg, 33 Eastern Outer Loop Dragon Lake, Zhengzhou 450003, Peoples R China