1. Department of Otorhinolaryngology, People’s Hospital of Beilun (Beilun Branch, the First Hospital of Zhejiang University), Ningbo, China
2. Department of Medicine and Equipment, The 988 Hospital of the Joint Logistics Support Force of the Chinese People’s Liberation Army Kaifeng, Hena, P.R. China
3. Department of Otolaryngology, Jinan Central Hospital. Jinan City, Shangdong, P.R. China